Rangers lost 2-1 at Dundee on Friday night, with former Ibrox target Scott Allan featuring.
Celtic had high hopes for Scott Allan but moments of magic have been fleeting at best.
Scott Allan had hoped to get his career back on track after swapping Celtic for Scottish Premiership rivals Dundee.
Scott Allan has joined Dundee on a season-long loan deal from Celtic.
Celtic won't sell Scott Allan on a permanent deal this summer - after a disastrous spell at Rotherham United, the midfielder is heading to Dundee on loan.
Scott Allan will have hoped to revive his career at Rotherham United but the Celtic loanee has not played since January.
Scott Allan joined Rotherham United on a season-long loan deal from Celtic in the summer transfer window.
Scott Allan returns to Celtic after a forgettable loan spell with Rotherham United.
The Bhoys midfielder has returned to Parkhead early.
Celtic loanee Allan is back at Parkhead six months ahead of schedule.