Sebastien Haller never feared he would be forced to retire and wants to return to action "as quickly as possible".
The Ivory Coast striker joined Borussia Dortmund from Ajax ahead of this season but is yet to feature for the Bundesliga side after discovering a malignant tumour during pre-season testing in July.
Haller underwent two surgeries and chemotherapy, with Dortmund chief executive Hans-Joachim Watzke stating the striker could return after the mid-season break.
The 28-year-old was present as Dortmund returned to training for the first time after the World Cup last week, although he was being "carefully introduced".
In comments to the media on Monday, Haller said: "I want to play as quickly as possible. There are no limits and restrictions on my involvement unless the medical staff tell me otherwise.
"[Returning is the] best feeling I could have. I didn't know what the future will bring, but I focused every day on staying fit.
"I can do everything now that I used to do before; that gives me great confidence.
"I took only 19 days off in the six months. It was hard, but it's my job and I love it."
Haller – who scored 34 goals in 43 games for Ajax last season before joining Dortmund for a reported €34.5million fee – also said he had never had concerns about his career coming to a premature end.
"[Retiring] was never on my mind," he said. "I had the mindset of looking forward and taking every day at a time. It was harder for my family, they suffered a lot because they didn't feel in control. They helped me a lot."
Also speaking at a press conference, Haller's Dortmund team-mate Marco Reus was delighted they could welcome the striker back into the fold ahead of the resumption of the Bundesliga season later this month.
"You can probably tell by my laughter, but it gives me goosebumps that he's back on the field," Reus told reporters. "I don't think he needs to say much at all, we were just so happy to have him back.
"I think we all took our hats off to the fight he put up and, above all, that he came back with a strength, with a mental strength that's really strong, and you can see it every day.
"He trains with us all the way; of course, he has a bit of catching up to do, but he pulls it off completely, and it's just a lot of fun to be back on the pitch with him, because of course he gives us a new alternative in the long run, which we perhaps don't have in our game yet.
"And that's why we're all doing well to stay calm, of course, and just give him a little bit of time until he finds his rhythm. That's going to take a little bit of time, but first and foremost just being healthy and playing what he feels most like playing."
On his own future, Reus also addressed recent rumours he will link up with Cristiano Ronaldo at Al Nassr in Saudi Arabia at the end of the season when his contract at Dortmund expires.
"I have a consultant to sort these things out," he said. "For me, it's just important that I stay in good health, that I do the complete training camp, do the games, and the rest you'll just really see in the future. But as I said, I have my advisor for that.
"Of course, you look ahead. And of course, I still have half a year left on my contract, and if I didn't worry about that, then it would be wrong.
"But actually, right now, I'm just happy to be back on the pitch and to be with the team. I mean, we are in sixth place and we really have other things to do right now. And that's where the focus is right now.
"Everything else will simply be decided in the next few weeks and months, and then we'll see in which direction it goes."
Brighton 0-4 Manchester City: Foden at the double as champions leapfrog Liverpool
Phil Foden scored twice as Manchester City leapfrogged Liverpool and kept the Premier League title race in their own hands by thrashing Brighton 4-0.
Foden moved onto 16 league goals for the season with a first-half brace at the Amex Stadium, seeing a free-kick deflect past a wrongfooted Jason Steele before stroking home after some reckless play from the Seagulls.
De Bruyne had earlier given City the lead with what was his 68th Premier League goal but the first with his head, as Pep Guardiola's men made light of Erling Haaland's injury-enforced absence.
Julian Alvarez added a fourth as City pulled two points clear of Liverpool and within one of Arsenal with a game in hand, knowing five further wins will guarantee they retain their crown.
Brighton, meanwhile, stay in the bottom half with 44 points, having been surpassed by Bournemouth on Wednesday.
Nathan Ake could not keep his shot down when presented with the first half-chance after a low-key start, but City went ahead with a brilliant goal after 17 minutes.
Foden slipped Kyle Walker in on the right flank, and De Bruyne watched the full-back's cross all the way before sending a wonderful diving header into the top-right corner.
There was more fortune about City's second, which arrived just nine minutes later as Foden's free-kick deflected in off Pascal Gross amid Brighton complaints about how Foden won the set-piece.
Brighton only had themselves to blame when Foden got his second after 34 minutes, though. Valentin Barco conceded possession cheaply on the edge of his area, and Foden swept the loose ball into the bottom-left corner.
Ederson denied Joao Pedro as Brighton improved in the second half, but City had further daylight just after the hour mark, Walker breaking in behind and beating Steele to a loose ball, with Alvarez on hand to turn home.
Brighton were enraged when Josko Gvardiol avoided conceding a penalty for a clumsy challenge on Pedro, who skewed wide late on as City – who went close to a fifth through Jeremy Doku late on and face struggling Nottingham Forest next – claimed a statement win.
Foden's star still rising
Foden has emerged as the favourite to be crowned Premier League Player of the Season, and he has gone up a gear in the run-in, also scoring a hat-trick on his last league appearance when City thrashed Aston Villa 4-1 earlier this month.
He was in imperious form again on Thursday, even if Brighton's fans were not happy with the way he went down for the free-kick that ultimately resulted in his first goal.
That strike was Foden's 50th in the Premier League, making him just the third player to score 50 top-flight goals under Guardiola while aged 23 or younger, after Lionel Messi and Erling Haaland.
It is no wonder Brighton's fans are sick of the sight of the England man; he has eight goals in his last eight Premier League appearances against the Seagulls, more than he has scored against any other club in the competition.
Seagulls' wings clipped
Hampered by injuries to the likes of Pervis Estupinan, Kaoru Mitoma and Evan Ferguson, Brighton have seen their European hopes falter in recent weeks and now appear to be limping to the finishing line.
Roberto De Zerbi's team are winless in their last five Premier League games (two draws, three defeats) and sit six points adrift of the top seven with matches against Bournemouth, Aston Villa, Newcastle United, Chelsea and Manchester United to come.
Brighton have even seen their supply of goals dry up, scoring just four times in eight league matches since thrashing Sheffield United 5-0 in February.
Foden matches Messi and Haaland feat with 50th league goal under Guardiola
Phil Foden equalled the feats of Lionel Messi and Erling Haaland when he scored his 50th league goal as Manchester City stormed into a 3-0 lead against Brighton.
Foden scored twice in the first half at the Amex Stadium on Thursday, setting Pep Guardiola's team on the way to a potentially pivotal win in the Premier League title race.
The England international's first, which came after Kevin De Bruyne's excellent diving header, came as his free-kick deflected in off the unfortunate Pascal Gross.
It was that goal that marked Foden's 50th in league football, with all of those coming under Guardiola.
That makes Foden just the third player to score 50 league goals under Guardiola while aged 23 or younger, after City team-mate Haaland and Barcelona great Messi.
Foden netted his 51st Premier League goal soon after, drilling in after City capitalised on some slack Brighton play.
Borussia Dortmund gearing up for crucial clashes against RB Leipzig and PSG
Borussia Dortmund are bracing for their two most important matches of the season.
Saturday's game at RB Leipzig in the Bundesliga is followed by a Champions League semi-final first leg at home to Paris-Saint Germain on May 1.
With the league title already wrapped up by runaway leaders Bayer Leverkusen, attention has shifted to the battle to qualify for the European competitions next season.
Dortmund's unexpected success in Europe has thrilled fans but the team's future in the continent's top club competition beyond this term could rest a lot on the result against Leipzig.
BVB are in fifth place on 57 points with Leipzig fourth on 59 and four games left in the campaign. The top four teams qualify for the Champions League group stage, although Germany is likely to earn a fifth spot as one of the top two in UEFA's coefficient table depending on the remaining results in European competition this season.
A Dortmund defeat against Leipzig would see them drift five points behind their rivals with three games remaining, so Edin Terzic's side are aiming to keep hot on their rivals' heels.
"It is a very important, decisive game against Leipzig," said Dortmund defender Nico Schlotterbeck.
"They are our direct rivals and it is a big difference for us finishing fourth or fifth.
"We lost against them earlier in the season and now we want to win this. It is the fight for fourth place."
Dortmund conceded a last-gasp equaliser in last week's 1-1 draw against Leverkusen but have won five of their last seven league games, including a 2-0 victory over Bayern Munich.
"It is extremely important for us to keep trying with 100 per cent to get that fourth place," said goalkeeper Gregor Kobel.
"We cannot sit back and relax until we have achieved that. We must maintain focus and step on the gas."
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