Roberts joined Celtic on loan from Premier League outfit City in the January transfer window on an 18-month deal.
The 19-year-old has been playing well for the Scottish Premiership giants, and Deila has made it clear that he will remain at Celtic Park until the end of next season.
“The deal we have with Manchester City is for 18 months and we did that because we wanted the player to have time to settle and get to know how we play before the summer and next season,” the Norwegian told The Glasgow Evening Times.
“We have always believed that he could be a big player for us. So there is no way he will be going back to Manchester City before the deal runs out. We made that very clear.
“We wanted him for the long-term loan. It was key to the move because we are trying to build a squad capable of performing and getting into the UEFA Champions League.”
Roberts is a very talented and promising young winger, and Celtic fans should be encouraged by Deila’s comments.
The former Fulham man seems to have settled into Scottish football well, and he could be a major player for the Hoops during the Champions League qualifiers in the summer.
Pep Guardiola, who will take charge of City in the summer, is well known for giving chances to young players, and one suspects that he will be keeping an eye on Roberts’ progress at Celtic Park.