Spaniard have raised his release clause which was set £25.8m to ward off potential suitors.
Andres Iniesta and Sergio Busquets remain a doubt for the clash with Los Colchoneros.
Los Blancos visit Celta Vigo at the weekend following 3-0 win over Real Sociedad.
Real Madrid looking to bounce back after their Copa del Rey exit in midweek.
Barcelona looking to stretch winning run to six games across all competitions.
Former Liverpool star was forced off during the 5-2 win over Real Sociedad on Thursday night.
France centre-back missed the 2-2 draw at Celta Vigo due to an injury.
James Rodriguez, Raphael Varane, Dani Carvajal, Pepe, Marcelo, Luka Modric and Gareth Bale remain out.
Sport reported in December that he had a deal in place to move to the Nou Camp in the summer.
Andres Iniesta, Sergio Busquets and Rafinha are ruled out for the second leg of the quarter-finals.
France boss said that his only focus is on the Copa del Rey decider against Celta Vigo on Wednesday night.
Modric, Marcelo, Carvajal, Coentrao, Pepe and Bale are also sidelined.
Marc-Andre ter Stegen, Ivan Rakitic, Andres Iniesta are also expected to sign new deals at the Nou Camp.
La Liga side chief says that the deal with the Hammers was completed one month ago.
Spaniard could be out for up to 15 days after suffering an ankle injury during the Sunday's win over Eibar.
The 17-year-old striker has been dubbed the next Zlatan Ibrahimovic.
The Sevilla boss has recently compared Barca's number 10 with Batman.
Modric is expected to return in around 10 days but the left-back could be out for up to a month.
Spain international midfielder suffered an injury during the Sunday's 4-0 win at Eibar.
Busquets was stretchered off during Barcelona's 4-0 win over Eibar on 22 January.
Barcelona looking to keep pace with La Liga leaders Real Madrid.
Former Brighton & Hove Albion striker submitted official transfer request on Thursday.