The Glasgow Rangers star made his Scotland debut in the 3-0 loss to France.
The Spurs centre-back has enjoyed his fellow Belgian's return to form.
The former Celtic star and current Fulham coach believes Dembele can reach the standard of past attacking heroes if he improves his strike rate.
The former striker believes now is the time for the Arsenal boss to be handed the job.
Moussa Dembele has claimed that Celtic wanted him as far back as January.
The Owls' players don't return to pre-season training until Monday after their participation in last season's Championship play-offs.
The 22-year-old left Accrington for Rangers earlier this summer.
Celtic beat competition from several Premier League clubs to sign Fulham's Moussa Dembele, and thrown the gauntlet down to Rangers.
Joey Barton and Michael Owen have their say on whether Glenn Hoddle should be appointed as the next England manager.
Glasgow Rangers boss Mark Warburton signed his eighth player for the Ibrox club this summer.