The 19-year-old joined the Magpies in 2013 from FC Metz, but failed to make a first-team appearance in his two years at the club.
Kemen has now completed a switch back to France by joining Lyon for an undisclosed fee on a four-year deal.
The midfielder said on Twitter: "Officially a Lyon player, really very happy to sign in this great club."
Kemen has represented France at Under-19 level.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Paris Saint-GermainPSG | 6 | 5 | 1 | 0 | 20 | 5 | 15 | 16 |
| 2 | MonacoMonaco | 6 | 5 | 1 | 0 | 12 | 3 | 9 | 16 |
| 3 | Marseille | 6 | 4 | 1 | 1 | 15 | 7 | 8 | 13 |
| 4 | Reims | 6 | 3 | 2 | 1 | 10 | 8 | 2 | 11 |
| 5 | Lille | 6 | 3 | 1 | 2 | 11 | 7 | 4 | 10 |
| 6 | Lens | 6 | 2 | 4 | 0 | 5 | 2 | 3 | 10 |
| 7 | NantesNantes | 6 | 2 | 3 | 1 | 9 | 6 | 3 | 9 |
| 8 | StrasbourgStrasbourg | 6 | 2 | 3 | 1 | 12 | 10 | 2 | 9 |
| 9 | Nice | 6 | 2 | 2 | 2 | 14 | 6 | 8 | 8 |
| 10 | Rennes | 6 | 2 | 1 | 3 | 10 | 9 | 1 | 7 |
| 11 | Lyon | 6 | 2 | 1 | 3 | 8 | 12 | -4 | 7 |
| 12 | Auxerre | 6 | 2 | 0 | 4 | 8 | 12 | -4 | 6 |
| 13 | Brest | 6 | 2 | 0 | 4 | 8 | 13 | -5 | 6 |
| 14 | Le HavreLe Havre | 6 | 2 | 0 | 4 | 7 | 13 | -6 | 6 |
| 15 | Toulouse | 6 | 1 | 2 | 3 | 5 | 8 | -3 | 5 |
| 16 | Montpellier HSCMontpellier | 6 | 1 | 1 | 4 | 6 | 17 | -11 | 4 |
| 17 | Saint-EtienneSt Etienne | 6 | 1 | 1 | 4 | 3 | 17 | -14 | 4 |
| 18 | Angers | 6 | 0 | 2 | 4 | 4 | 12 | -8 | 2 |
| > Ligue 1 Full Table | |||||||||
