The Malian, who won 14 trophies in four seasons with Barca between 2008 and 2012, joins on a free transfer from Chinese side Dalian Aerbin.

"Upon completion of a medical, Seydou Keita will sign with Valencia until June 30, with the option for another season," said a statement on the club's website.

Valencia also announced on Thursday that Dorlan Pabon, Helder Postiga and Andres Guardado were leaving the club on loan.

Colombian Pabon will return to South America to join Sao Paulo, whilst former Spurs striker Postiga is bound for Serie A side Lazio.

Meanwhile, Mexican international Guardado is headed for Bayer Leverkusen in a bid to improve his chances of a starting place at this year's World Cup.