The 18-year-old impressive enforcer has joined the European outfit on a three-year contract after undergoing successful medical.
Bruce signed a pre-contract with the side after he impressed on a two-week trial in August last year.
He has now completed all formalities to begin his European adventure in a move that will excite manager Maciej Skorza.
''I am looking forward to repay the confidence that the coach and the directors have imposed in me and will try to win trophies with them.
''The sky is not the limit for me and I believe this great club will offer me the platform to showcase what I can also do.''
He will be officially be unveiled on Wednesday.
He was member of Ghana's youth team which played at the 2011 African Youth Championship held in South Africa.