The Algerian international revealed in May that he has asked to leave the former Premier League champions.
"Riyad stated his position very clearly," Shakespeare told reporters in a press conference in Hong Kong. "Mine is really simple; while he is here and while we have had no bids - and we haven't had any bids, it's all been speculation - he has to be committed to the football club.
"And I have to say, in the two weeks he's been back he's been totally committed and really trained well. Outgoings are inevitable at any football club but until there's a bid for your player there's no decision to be made."