The 17-year old striker and his Bairns teammates take on Hibernian in the Scottish Cup semi-final on Saturday and Sibbald is eager to put his best forward just as he did during a training spell with Manchester United last May.
Sibbald scored a screamer in a United reserves game before adding a second goal but manager Sir Alex Ferguson did not see it as he was away from Carrington, purchasing a racehorse and this weekend he is keen to again perform, this time on the big stage.
"It was amazing - an incredible opportunity to see what it's like down there and what you need to do to play for a club like that," he said.
"The facilities were unreal and it gives you the added incentive to work hard every day in the hope that you could maybe one day reach that level.
"On one of the days we played in a reserve game. (Falkirk teammate) Jay (Fulton) and I were either side of Anderson in midfield, with the Belgian international Richie de Laet at the back.
"I scored both goals in a 2-0 win and one of them was up there with the best I've ever scored.
"It flew in the top corner but Sir Alex Ferguson missed it. Someone told me he was away buying a horse but I don't know if that's right. I think Stevie Crawford got it on video so maybe I'll need to send it to him."