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 | |
| C | Paris Saint-GermainPSG | 33 | 21 | 10 | 2 | 79 | 33 | 46 | 73 |
| 2 | MonacoMonaco | 33 | 19 | 7 | 7 | 64 | 42 | 22 | 64 |
| 3 | Lille | 33 | 16 | 10 | 7 | 50 | 32 | 18 | 58 |
| 4 | Brest | 33 | 16 | 10 | 7 | 50 | 34 | 16 | 58 |
| 5 | Nice | 33 | 15 | 9 | 9 | 38 | 27 | 11 | 54 |
| 6 | Lens | 33 | 14 | 8 | 11 | 43 | 35 | 8 | 50 |
| 7 | Lyon | 33 | 15 | 5 | 13 | 47 | 54 | -7 | 50 |
| 8 | Marseille | 33 | 12 | 11 | 10 | 50 | 40 | 10 | 47 |
| 9 | Rennes | 33 | 12 | 10 | 11 | 52 | 44 | 8 | 46 |
| 10 | Reims | 33 | 12 | 8 | 13 | 40 | 46 | -6 | 44 |
| 11 | Toulouse | 33 | 11 | 10 | 12 | 42 | 43 | -1 | 43 |
| 12 | Montpellier HSCMontpellier | 33 | 10 | 11 | 12 | 41 | 46 | -5 | 40 |
| 13 | StrasbourgStrasbourg | 33 | 10 | 9 | 14 | 37 | 48 | -11 | 39 |
| 14 | NantesNantes | 33 | 9 | 6 | 18 | 30 | 51 | -21 | 33 |
| 15 | Le HavreLe Havre | 33 | 7 | 11 | 15 | 33 | 43 | -10 | 32 |
| 16 | Metz | 33 | 8 | 5 | 20 | 35 | 56 | -21 | 29 |
| 17 | Lorient | 33 | 6 | 8 | 19 | 38 | 66 | -28 | 26 |
| R | Clermont | 33 | 5 | 10 | 18 | 26 | 55 | -29 | 25 |
| > Ligue 1 Full Table | |||||||||
