The 18 year-old winger has won a contract after successful trials.
Dad Dean told De Telegraaf: "Kenji plays the next three months on loan for Swansea and has signed a contract until 2014 with an option for another season.
"Celtic would like Kenji.
"He also had one week under Neil Lennon. He was pleased, but wanted him to promise a contract, then the choice of the Premier League and Swansea arrived."