Valencia announced that Keita, pending a successful medical, will pen a contract tying him to Los Che until the summer, with the option of a further season after that.
Valencia added that the 34-year-old Mali international is due to arrive in Spain later today to put the finishing touches on his move.
A club statement read: "The midfielder Seydou Keita, subject to a medical, will sign with Valencia until June 30, with the option of a further season more.
"The Mali international, who had played at Chinese Super League club Dalian Aerbin until December 31 of last year, will arrive this afternoon at 1635 (local time) at the Manises airport."
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