I agree with Pauldolski10 on this one. I think Gleeson sounds like he would be a very decent addition. He has played > 300 games in the last 9 years at a respectable level with nearly half of those appearances in the Championship. So he would add bags of experience to our midfield.
Plenty on here described Ryan Jack as a lot worse than a wimp. Despite that, he was still an important player in the team.