The 19-year-old moved to Charlton Athletic on loan last month but has struggled to establish himself in the Addicks' first team, making only three substitute appearances for Alan Pardew's side.

Sinclair enjoyed a more productive loan spell with Plymouth Argyle last term, scoring four goals in 18 games for the Championship side, before scoring once in nine appearances for QPR during another temporary switch earlier this season.

Meanwhile, the Blues will travel to Asia for a pre-season tour in the summer.

Chelsea will play a Malaysian Selection team on July 29 with an earlier match in another Asian country set to be confirmed later this week.