Keane has scored three goals in five starts and impressed in a deeper role behind Darren Bent.
McLeish said: "Will Robbie return? I don't know. We have to see where we are in terms of recruitment in the summer but Robbie has had a good influence on the place.
"Where he is right now probably has a glamorous feeling about it but at the same time he's got a bit of adulation from Villa fans so maybe that has probably whetted his appetite."