Lionel Messi showed exactly why he was given a lucrative contract as his 650th Barcelona goal helped Ronald Koeman's side to a slender 2-1 win over Athletic Bilbao.

A report by El Mundo claimed the deal Messi signed at Camp Nou in 2017, which expires at the end of this season, is worth more than €555million.

He demonstrated his value to this Barca team midway through the first half on Sunday with his 49th successful free-kick strike for the Catalan giants.

Jordi Alba put through his own net early in the second half to draw Athletic level, but Antoine Greizmann ensured Barca leapfrogged Sevilla and Real Madrid into second - 10 points behind leaders Atletico Madrid - with a close-range finish 16 minutes from time.

Unai Simon twice denied Barca inside the opening seven minutes, first pawing away Messi’s clipped effort from close range before diverting Griezmann’s powerful drive over the crossbar.

There was little the Athletic goalkeeper could do to deny Messi after 20 minutes, the Argentinian whipping a sumptuous free-kick into the top right corner from 25 yards.

Ronald Araujo fizzed an effort wide soon after, while Ousmane Dembele lashed over from a promising position shortly before the interval as Barca dominated.

Athletic drew level four minutes after the interval, however, as Alba turned Raul Garcia's left-wing cross into his own net under pressure from Oscar De Marcos at the back post.

Simon superbly kept out Miralem Pjanic's header shortly before the hour mark, while Griezmann nodded wide from Dembele's teasing cross.

The France international had the final say, though, sliding home Oscar Mingueza's low cross into the roof of Simon's net to seal a fourth consecutive win in all competitions for Barca.

Frenkie de Jong and Jordi Alba were granted a rest as Ronald Koeman called Alex Collado up for Barcelona's Copa del Rey clash with Cornella on Thursday.

Koeman gave a break to De Jong (2,166) and Alba (1,927), who rank first and third respectively for minutes played in all competitions at Barca this season.

Lionel Messi (1,939) separates them but misses the trip to the Segunda B side as he serves the first game of a two-match ban following his sending off in the Supercopa de Espana final defeat to Athletic Bilbao on Sunday. The suspension could yet be reduced to one game as Barca lodged an appeal.

Koeman has taken the chance to include 21-year-old Barcelona B midfielder Collado in a matchday squad for the first time since taking over in August.

Collado made his Barca debut in May 2019 but has only managed one further first-team appearance since then.

Fellow Barca B players Ilaix Moriba, Arnau Tenas and Konrad de la Fuente have also been named in the 20-man group.

Koeman still has plenty of experienced players available to him and will hope to avoid a shock exit like Atletico Madrid and Real Madrid have suffered this season.

Cornella stunned Atletico in the second round and will be keen for another scalp, while Madrid were on the receiving end of a 2-1 loss to 10-man Alcoyano after extra time on Wednesday.