Sinclair won the Cup Winners' Cup as a Chelsea player and is convinced winning a trophy will lift the players' individual belief and confidence.
He told Tribalfootball.com: "Obviously it's it's not the biggest trophy in Europe, but there's still a culture to try and create at the football club or recreate and to do that it's by winning things. So to start off with winning this competition I think is fantastic for the future.
"When you look at Jose Mourinho's first season at Chelsea, he won the League Cup, the first Cup he won, and people downplayed that, you know, and didn't realise that it was stepping stones to what Chelsea were going to achieve over the next 20 years or so.
"So I wouldn't take it lightly. It's a culture of winning, especially with a young group of players. And I think that will bring them a lot of confidence going back into the Premier League next season and obviously back in the Champions League next season."
- Frank Sinclair was speaking to Tribalfootball.com on behalf of Best casino sites in the UK