Xavi is "very optimistic" that Barcelona can further strengthen in the January transfer window, but is unsure whether forward Ousmane Dembele will remain at Camp Nou beyond this season.
Despite their well-publicised financial issues, with debts rising above €1.2billion last year, Barca have brought in Ferran Torres from Manchester City this month for an initial €55million (£46.7m).
Barca will be unable to register Torres until they have offloaded some other players as they would risk exceeding their salary cap, yet other big-name stars continue to be linked with a switch to Camp Nou.
Among those touted as a target for the Catalans is Erling Haaland, with club president Joan Laporta this week refusing to rule out a potential move for the in-demand Borussia Dortmund striker.
Responding to rumours regarding his side's interest in Haaland, Laporta told the football world to "get ready" because Barcelona "are back".
Xavi shares Laporta's enthusiasm and believes the arrival of Torres, who was presented at Camp Nou on Monday, will galvanise supporters following a poor first half to the campaign.
"I'm very close to [Laporta] and I'm very optimistic. I like his ambition," Xavi said at a news conference previewing Wednesday's Copa del Rey last-32 tie with Linares Deportivo.
"We are working to return. We are close to the Champions League positions. It is not easy, but we are working hard to give Barca what it deserves. We are on the right track.
"The signing of Ferran Torres makes the fans breathe as well. We are working practically 24 hours a day. We must follow the president's lead. It is a positive message to say that we have returned.
"If we sink into misery, it does not help. We must be positive. The president leads the way."
Haaland has scored 76 goals in 75 games for Dortmund since making his debut in January 2020, a tally bettered by only Bayern Munich's Robert Lewandowski (103 goals in 87 games) among players from Europe's top five leagues in all competitions.
Alvaro Morata, currently on loan at Juventus from Atletico Madrid, has been touted as another potential option for Barca to bolster their attack, which was depleted by the high-profile exit of Lionel Messi in August.
Asked about the links with Haaland and Morata, Xavi said: "I don't want to talk about hypotheses, only the players we have here.
"They are both great players but they are not ours. If Morata signs for Barcelona then I will answer questions on him."
Barca cannot realistically bring in more players until others make way, however, with the likes of Philippe Coutinho and Ousmane Dembele potentially on their way out.
Coutinho has started just five games all season, while Dembele is into the final five months of his deal and is officially free to sign a pre-contract agreement with clubs from abroad.
The France international's time in Catalonia has been hampered by a succession of injury setbacks, but when fit he has made an impact and averages 0.6 goals or assists per 90 minutes in LaLiga, which is a similar amount to Antoine Griezmann (0.67) and team-mate Memphis Depay (0.66).
"We have to wait for Dembele," Xavi said. "I'm calm as I can't do anything else. Dembele has to make an effort and think about his future – it depends on him.
"As for Philippe, I've not spoken with him. He's a professional and helps us a lot. But in order for us to have entries, there must be exits."
Xavi also confirmed Barca are hopeful of having Dani Alves, another recent recruit, registered ahead of the midweek cup tie with third-tier Linares Deportivo.
Alves' only appearance since early September was in a friendly against Boca Juniors last month, but Xavi expects the experienced full-back to play a big part in the remainder of Barca's campaign.
"I see him very well. He is spectacular in training, with a lot of intensity and a professionalism," Xavi said.
"He will help us a lot with his arrival on the wing. He is 38 years old, but as is training will help us in many games. He is a superb player and I hope he can play every three days for us."
Celtic 3-1 RB Leipzig: Kuhn double inspires Hoops to Champions League fightback
Celtic's Nicolas Kuhn scored twice as the Bhoys fought back to clinch an impressive 3-1 victory over RB Leipzig in the Champions League on Tuesday.
Coming off a goalless draw at Atalanta on matchday three, Celtic recorded their second home win in the Champions League this season, moving up to 13th in the standings on seven points.
They had to do things the hard way, falling behind to Christoph Baumgartner's close-range header after a corner came off Cameron Carter-Vickers in the 23rd minute.
However, Kuhn levelled in the 35th minute with a superb curling effort from the edge of the box, then tapped into an open net for his brace shortly before half-time.
Benjamin Sesko and Baumgartner went close to equalising after the break but Celtic's birthday boy, 38-year-old goalkeeper Kasper Schmeichel, pulled off a couple of fine saves before Reo Hatate sealed victory with a close-range finish in the 72nd minute.
Leipzig's wait for a first point in the Champions League this campaign continues, with their chances of reaching the knockout stages fading after four defeats in as many games.
Data Debrief: Celtic flying high
Celtic may have been humiliated in a 7-1 defeat to Borussia Dortmund on matchday two, but that was a mere blip in what has so far been an impressive European campaign.
Their total of seven points is already their most in a Champions League campaign since 2012-13, when they collected 10, while they last netted more goals (currently nine) in a Champions League/European Cup campaign in 1977-78 (13).
Borussia Dortmund 1-0 Sturm Graz: Malen late show extends Champions League home record
Donyell Malen netted an 85th minute winner to hand Borussia Dortmund a narrow 1-0 victory over winless Sturm Graz in the Champions League on Tuesday.
A dominant showing from Nuri Sahin's side made it three wins from four games so far in the competition, moving them up to fourth in the new 36-team league.
Dortmund started brightly at the Westfalenstadion but were unable to find a breakthrough, with Marcel Sabitzer, Maximilian Beier and Serhou Guirassy going close.
They recorded 13 shots in the first half, their most in the opening 45 minutes of a Champions League match without scoring since Opta recorded this data (since 2003-04).
But Sturm Graz offered a threat on the break after the interval, with Jusuf Gazibegovic curling an effort narrowly wide before Mika Biereth missed a header from close range.
However, Dortmund left it late to seal the win as Malen pounced on Emanuel Aiwu's loose pass before being sent through by Guirassy, with the Dutchman rattling the ball beyond
Kjell Scherpen to seal another Champions League home win.
Data Debrief: Home comforts
While Sahin has come under fire for Dortmund's displays away from home, there is no arguing with his record at the Westfalenstadion.
He became the first Dortmund coach since the Bundesliga was founded to win each of his first seven home matches in charge (all competitions), while BVB are now unbeaten in 13 consecutive Champions League home games (W9 D4) - an extended club record.
Malen’s winner was timed at 84:56, Dortmund’s latest winning goal in a Champions League match since Kevin Groskreutz netted against Marseille in December 2013.
Lille 1-1 Juventus: French side's resistance broken after second-half penalty
Lille held firm to hold Juventus to a 1-1 draw at home on Tuesday in the Champions League, extending their unbeaten run to nine matches.
Jonathan David had fired the French club ahead in the first half, before Dusan Vlahovic scored a second-half penalty to level things up and leave both sides on seven points after four matches.
Things didn't start well for the home side, with Teun Koopmeiners thinking he had scored the opener for Juventus only for it to be disallowed for offside.
David put Lille ahead just three minutes later with their first chance of note in the match. The Canadian turned home to convert from a slick counter-attacking move.
Goalkeeper Lucas Chevalier had to be on form to keep the home side ahead before half-time, sensationally saving a Vlahovic half-volley 10 minutes before the break. Koopmeiners, meanwhile, had another effort chalked off in the 42nd minute.
Juventus upped the pressure in the second half, with Chevalier also upping things and pulling off two impressive saves in quick succession.
But ultimately, the Lille resistance was broken by a Vlahovic penalty on the hour after Francisco Conceicao had been fouled by Benjamin Andre.
The result leaves Juventus 10th and Lille 12th in the Champions League table.
Data debrief: Lille looking good for qualification
After drawing 1-1, Lille are unbeaten in nine matches in all competitions and three matches in the Champions League.
The French side had beaten Atletico Madrid and Real Madrid in back-to-back European games.
They now have a seven-point buffer between themselves and the bottom eight in the league table.
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