Sinclair moved to the Premier League champions during the summer and despite being booed by the club's supporters before his move to City was completed, Routledge has insisted that everyone at Swansea were happy for the 23-year-old.
Routledge said: "People get on well here and we all wish each other the best. Scott had a chance to go and join the champions and he took that opportunity.
"I haven't spoken to Scott for a little while because he's had a lot to do up there, he's moving, but I'm sure we'll catch up on Saturday."
Routledge and Sinclair could face each other on Saturday evening when City host Swansea at the Etihad Stadium.