The 17 year-old made his first team debut with the French Ligue 1 club earlier this season.
Sporting Director Damien Comolli said: “Adel is recognised as one of the best talents in Europe for his age group and as a club we’re especially pleased that we beat several leading Premiership clubs to his signature.
“He will be a healthy addition to the squad and is a continuation of our policy of attracting the best young talent as we constantly seek to improve the quality of the team both now and for the future.”
The Club is delighted to announce that agreement has been reached with Lens for the loan of French midfielder Adel Taarabt. Adel will register with the Club once we have received his International Transfer Certificate from the French Football Federation.An attacking midfielder who can also play as a second striker, Adel can additionally play wide on either wing. He has represented France at U-16, U-17 and U-18 level.