The midfielder has been missing for four months due to knee injury.
"It's a big two weeks for Diame. He's been out for four months now," Tigers boss Steve Bruce told the Hull Daily Mail. "Last week he looked as if he hadn't been away. We realised what we were missing, put it that way.
"When he's right and ready, of course, he'll be a big addition for us. He's been out for a long time."