The 30-year-old Frenchman was on loan with the Spanish side last term, playing 36 games and establishing himself as a key member of the team.
"Florian is on his way to Spain" said Bruce.
"It looks as if something is going to happen there. It will put a few quid in the coffers.
"He is going back to Alaves where he was on loan and there is something imminent."
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