Dembele has enjoyed a brilliant start to life with Celtic.
Celtic have dropped points in their last two league fixtures.
Norwich City and Queens Park Rangers-linked James Forrest has turned down a new contract offer from Celtic.
Nadir Ciftci joined Celtic from Scottish Premiership rivals Dundee United.
Former Celtic player Joe Miller has suggested Nadir Ciftci needs to buck up his ideas at Parkhead.
Former Celtic midfielder Joe Miller has suggested what's different for Ronny Deila this summer compared to last.