Jordan Ayew was a second-half substitute as his Aston Villa side suffered 1-0 home defeat to Stoke City in the English Premier League on Saturday.
The Ghana striker came on as a substitute in the 59th minute as his side dropped into the relegation zone.
Ayew replaced Sinclair but could not help his side to secure the much needed win.
Marko Arnautovic scored the only goal to give Stoke a second successive win and leave Aston Villa cut adrift in the Premier League relegation zone.
Arnautovic, who also had an effort ruled out for offside, exploited a huge gap in the Villa defence early in the second half to finish off the post.
Villa created little bar a credible Jordan Veretout appeal for a penalty.
Tim Sherwood's side have not won since the opening day and lie 18th, four points from safety.