Lionel Messi will have the final say over whether he plays a part in Barcelona's Supercopa de Espana final showdown with Athletic Bilbao on Sunday.
The Argentina international missed Wednesday's penalty shoot-out victory over Real Sociedad in the semi-finals due to what was described as "discomfort".
He trained individually on Friday and then with the rest of his team-mates on Saturday, though Koeman is unsure if his star man will be available to face Athletic at Estadio La Cartuja.
"We will see. The player himself always has the last word," Koeman said at his pre-match news conference when asked if Messi will play.
"We will wait until Sunday morning to see how his body reacts. We are hopeful he will be available tomorrow.
"If you have the best players in your side, you always have a better chance of winning. We are talking of the number one player in the world.
"With Leo the team is stronger in terms of creativity and effectiveness, which we otherwise sometimes lack. We have a system in mind but it depends if Leo is involved or not."
Sunday's clash with Athletic presents Koeman with an opportunity to win his first piece of silverware as Barca boss.
The Catalan giants, who have won the competition a record 13 times, have had four days to recover for the game and Koeman feels his players are in good shape.
"The team is fine and happy to play the final," he said. "We are very tired, but we have had enough time to fully recover.
"A difficult game awaits us, against a rival who works hard and is very competitive. We have to try to play our game.
"It is always important to win things to know that we are on the road. We know that it is not the most important competition, but it is always something for any of us to celebrate.
"Winning shows us that we are on the right track. It will not be so decisive, but good for the confidence and to show that we have improved things.
"It is another game to show that we are a strong team and that we fight every game. We will find an opponent who will have all their players ready."
Athletic are 13 points below Barca in LaLiga but Koeman is wary of opponents who knocked out Real Madrid to reach the final.
"It is a demonstration that tomorrow everything is possible," he said.
"If Athletic are as competitive as they were [against Madrid] then it can make for a complicated game. They were effective against Madrid and deserved to go through."
While Barca are gearing up for a cup final on the field, matters off it also remain a hot topic of discussion.
It was announced on Friday that the presidential elections, originally scheduled to take place this month, have been pushed back until March.
That delay means Barca are no longer in the market for new players, ruling out a rumoured move for Manchester City defender Eric Garcia, but Koeman fully understands the situation.
The Dutchman said: "I have to tell you that I'm fine, happy. I know perfectly well the financial limitations of the club. If that is not possible, we will go ahead with what we have."
Coventry City 2-3 Hull City: Tigers win five-goal thriller to keep play-off hopes alive
Hull City kept their hopes of gatecrashing the Championship play-offs alive with a thrilling 3-2 win over beaten FA Cup semi-finalists Coventry City on Wednesday.
Noah Ohio scored the winner with his first touch after coming on as a second-half substitute as Hull moved within three points of sixth-placed Norwich City with two games to play.
Coventry, meanwhile, saw their own hopes of returning to Wembley Stadium for a second successive play-off final all but ended, as they sit six points further back with three matches remaining.
Three days on from their remarkable comeback against Manchester United, the Sky Blues twice fought back to level things at Coventry Building Society Arena. Jaden Philogene's shot squirmed under goalkeeper Bradley Collins to put Hull ahead 31 minutes in, but Kasey Palmer levelled within five minutes with a stunning free-kick.
Hull went back ahead in controversial circumstances on the stroke of half-time, Liverpool loanee Fabio Carvalho converting from the penalty spot despite replays showing Joel Latibeaudiere's foul on Liam Delap took place outside the area.
Mark Robins' men again dragged themselves back into the game as Bobby Thomas headed Jay Dasilva's cross in just before the hour mark, but it was Liam Rosenior's visitors who found a winner.
Thomas went from hero to villain as his poor back pass sold Collins short, and Ohio got a toe to the ball to score the winner, keeping Hull's hopes of Premier League football intact.
Van Dijk: Liverpool have 'no chance' in title race after derby defeat
Virgil van Dijk conceded Liverpool might be out of the Premier League title race after they suffered a surprise 2-0 defeat to Everton in Wednesday's Merseyside derby.
Jarrad Branthwaite and Dominic Calvert-Lewin scored in either half to give the Toffees their first win over Liverpool at Goodison Park since 2010.
Liverpool struggled to find a way through the Toffees' defence despite dominating for long periods, and the Reds' captain says they will not outlast Arsenal and Manchester City without major improvements.
Speaking to Sky Sports, Van Dijk said: "If we play like today, then we have no chance to consider ourselves in the title race.
"We have to just focus on the next game and that will be a tough one anyway, so we will see.
"We're very disappointed, in so many ways. I think everyone has to look at their own performances. Did they really give everything, and do they really want to win the league?
"We're still fighting and there are still games after tonight, but if we play like we did overall in the game today – not winning challenges and giving the referee a chance to give free-kicks like he did many times, then you have no chance to win the title."
Howe: Newcastle performance in Palace defeat 'way off' Spurs win
Eddie Howe admitted Newcastle United's performance in the 2-0 loss at Crystal Palace on Wednesday was "way off" the one that saw them thump Tottenham in their previous game.
Howe's men hammered Spurs 4-0 in their last match, but they never got close to matching the attacking verve from that outing and a Jean-Philippe Mateta double condemned the Magpies to defeat at Selhurst Park.
Newcastle didn't even manage a shot on target until the 87th minute, accumulating just 0.42 xG (expected goals) as the likes of Alexander Isak and Anthony Gordon struggled to make an impact.
Only against Manchester City in August (one) have Newcastle recorded fewer shots on target in a Premier League game this season than their two against Palace, and Howe was critical of his team's display in the loss, one that all but ends their hopes of finishing in the top four.
"[It is a] bad day for us," Howe told Newcastle's club media.
"I thought we were disappointing today, especially in the first 60 minutes. We were way off our levels against Tottenham and our best levels.
"I thought technically we didn't deliver a good performance, and out of possession I don't think it was a particularly good performance either."
Newcastle were unlocked twice for Mateta to score by a Palace side who themselves only generated 0.88 xG.
Howe was left frustrated by the manner in which his side conceded, adding: "I think we'll be disappointed with our performance technically today, and that's probably epitomised by the two goals where we're disappointed with how we've given them the ball in those situations and then how we defended.
"I think the goals sum up aspects of our performance where there was some good, lots of moments that could have led to opportunities, but we were slow to shoot around the box," he said.
The defeat, combined with Manchester United's 4-2 win over Sheffield United, means Newcastle drop to seventh, while eighth-placed West Ham are two points behind with a game in hand.
Newcastle have now lost eight of their last 11 Premier League away games, while they have lost on four occasions in London in the league this term, only doing so more times in a Premier League season in 2000-01 and 2005-06 (both five).
It's been a disappointing season for Howe and his side, especially compared to the heroics of last term when Newcastle finished in the top four, and the Magpies boss knows there's work to be done to get back to those levels.
"It's a day that we have to take our punishment, deal with it, and then try and improve," Howe continued. "It's frustrating because we know we're capable of much better."
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