The striker was given a rare outing for the first team in the challenge match in Marbella and responded by heading the winner as Celtic came from behind to win 2-1.
Bangura has failed to make an impact, or score a competitive goal, since joining Celtic for about £2million from Swedish side AIK in 2011, although a knee injury hindered his progress.
The 23-year-old only made three starts for Celtic - and 10 substitute appearances - before being loaned back to AIK in August.
The Sierra Leone international has yet to feature for the first team since his loan ended last month but feels he is ready to make his mark.
Bangura told Celtic's official website: "I don't know even know how to explain myself as I feel really great and happy.
"I have to say thanks to everyone - my team-mates and the coaches who have given me a chance, as this what I need. Hopefully, I will get some more.
"I need to score goals as this gives me confidence and now I need to play more games.
"This is why I went on loan as I was injured and then when I came back I needed matches. So I went and scored a couple of goals and got my belief back.
"I am delighted to be back and score my first goal for Celtic. It was good for me.
"It was a good cross from Kris Commons and I just managed to head it down into the far corner.
"I now have to fight to be in the team, to get chances and hopefully bang in some more goals."