Lionel Messi’s 45th Clasico on Saturday could also be his last as Barcelona look to rubberstamp their progress under Ronald Koeman by beating Real Madrid and claiming top spot in La Liga.

The reward for the winners at Valdebebas will be knocking Atletico Madrid out of first place for the first time since December, before they mounted a run that saw them go 10 points clear with a game in hand at the start of February.

But Atletico’s recent struggles, combined with a surge in momentum for Madrid and Barca, has seen that advantage evaporate, the question now whether Diego Simeone’s team can recover and regroup to even stay in the race through the final stretch.

Who Atletico have to hold off or, more likely, catch in the last nine games could depend on this weekend’s result at the Alfredo di Stefano stadium, where both clubs will be hoping for the ultimate vindication of recent improvement.

Success for Barcelona would be another significant check-point too in what has been an uplifting few months, the start of a recovery that has run alongside the ongoing uncertainty of what Messi will decide this summer.

Messi’s every goal and glance this season has been analysed for possible indications as to the 33-year-old’s thinking but what is clear is how the atmosphere at Barca has changed since he asked to leave for free last August. Joan Laporta’s election as club president, replacing Josep Maria Bartomeu, has brought enthusiasm and, crucially, a sense of direction again, even if the financial problems from the last regime are still very much the problems of the new one.

More persuasive might be what Messi has seen and felt on the pitch, witnessing a team that was broken a year ago gradually piece itself back together under Ronald Koeman.

Koeman has trusted the club’s youngsters and Messi has nurtured them. Pedri, Ronald Araujo, Sergino Dest, Oscar Mingueza and Ilaix Moriba have flourished. And Messi has thrived too, reclaiming his place at the top of the league’s scoring charts with 23 goals so far, and 19 goals in 20 games since the turn of the year.

It may not be enough, given Barcelona were also convincingly beaten by Paris Saint-Germain in the last 16 of the Champions League.

Beating Athletic Bilbao in the final of the Copa del Rey or even Real Madrid and Atletico to the title in La Liga could still see Messi bid farewell.

But if this is to be his last Clasico, 16 years after his first, 44 games that have included 26 goals and two hat-tricks, Messi might see it now as an extra season well spent, the sense of deflation and bitterness gone, and his own place in the revival secure.

“There is only one person who can decide his future and it is him,” Koeman said in February. “I would like him to stay for many more years and I just try to make sure he is happy, like he is at the moment.”

Whatever the result, Atletico will have the chance to go back to the top of the table on Sunday when they play Real Betis. Zinedine Zidane meanwhile said that he hoped Messi and Sergio Ramos won’t have played their last Clasicos come the end of the season, with doubts over the futures of the Barcelona and Real Madrid captains ahead of a huge La Liga encounter. When asked if Saturday’s clash in the Spanish capital would be the last of the pair’s careers at Spain’s top two clubs, Madrid coach Zidane said: “I hope not”.

“Sergio is not going to play tomorrow. It’s sad, but I really hope that he will stay here,” the Frenchman added of the injured 35-year-old.

Zidane also sad that he hoped Messi woud remain at Barca for the good of Spanish football, joking “let him stay at Barcelona -- he’s doing very well there!”


Spanish League fixtures (GMT):
Saturday: Getafe vs Cadiz (1200), Athletic Bilbao vs Alaves (1415), Eibar vs Levante (1630), Real Madrid vs Barcelona (1900); Sunday: Villarreal vs Osasuna (1200), Valencia vs Real Sociedad (1415), Real Valladolid vs Granada (1630), Real Betis vs Atletico Madrid (1900); Monday: Celta Vigo vs Sevilla (1900)