Sinclair found the net during his cameo with Tim Sherwood watching from the stands.
The new Villa boss takes over from Paul Lambert who was sacked during the week with the side in the relegation zone and struggling for goals.
But the side managed to make it through to the quarter-finals of the FA Cup with a 2-1 win over Leicester City at Villa Park yesterday, with Sinclair managing to get on the scoresheet in the closing stages, with his strike ultimately ending up as the winner.
He's quoted by BTSport, saying: "There was a lift, but I have only been here two weeks so I'm trying to take in as much as I can.
"There is a lift from the fans and all we can do is concentrate game by game and take it into the next one.
"I'm looking forward as much as anyone else in the team to working with him. Hopefully he brings something different and it rubs off on the boys and we win games."
Sinclair only joined from Manchester City on loan during the most recent transfer window so didn't have much time to adapt to Lambert's way of working.
However, is cameo in the closing stages of the win over the Foxes will have caught the eye of his new boss watching from the stands.
The 25-year-old will be hoping for some regular game time from the start under Sherwood having struggled to get first team opportunities following his move to Manchester City from Swansea City two seasons ago, with his most recent loan spell at West Bromwich Albion not having the desired effect.