The young forward was coveted by major clubs across Europe.
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Last season, the France youth international scored nine goals in 18 games for Le Havre's Under-19s team and earned a place on the bench for the first team on two occasions.
Following the signing of his United contract, it was confirmed Kana-Biyik will move to Swiss Super League side, Lausanne-Sport, on-loan for the season.
The 18 year-old is the son of former Cameroonian national team star André Kana-Biyik. For the moment, the length of his contract is yet to be disclosed.