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 | 31 | 22 | 5 | 4 | 70 | 29 | 41 | 71 |
| 2 | Marseille | 31 | 17 | 8 | 6 | 51 | 29 | 22 | 59 |
| 3 | Rennes | 31 | 17 | 5 | 9 | 67 | 31 | 36 | 56 |
| 4 | StrasbourgStrasbourg | 31 | 14 | 10 | 7 | 52 | 33 | 19 | 52 |
| 5 | Nice | 31 | 15 | 7 | 9 | 40 | 27 | 13 | 51 |
| 6 | MonacoMonaco | 31 | 14 | 8 | 9 | 47 | 32 | 15 | 50 |
| 7 | Lille | 31 | 12 | 12 | 7 | 39 | 36 | 3 | 48 |
| 8 | Lens | 31 | 13 | 8 | 10 | 48 | 40 | 8 | 47 |
| 9 | NantesNantes | 31 | 13 | 7 | 11 | 40 | 34 | 6 | 46 |
| 10 | Lyon | 31 | 12 | 11 | 8 | 44 | 40 | 4 | 46 |
| 11 | Montpellier HSCMontpellier | 31 | 12 | 5 | 14 | 44 | 44 | 0 | 41 |
| 12 | Brest | 31 | 10 | 9 | 12 | 39 | 45 | -6 | 39 |
| 13 | Reims | 31 | 8 | 12 | 11 | 34 | 35 | -1 | 36 |
| 14 | Angers | 31 | 8 | 9 | 14 | 35 | 45 | -10 | 33 |
| 15 | Troyes | 31 | 8 | 8 | 15 | 29 | 44 | -15 | 32 |
| 16 | Lorient | 31 | 7 | 10 | 14 | 31 | 50 | -19 | 31 |
| 17 | Clermont | 31 | 7 | 7 | 17 | 31 | 60 | -29 | 28 |
| 18 | Saint-EtienneSt Etienne | 31 | 6 | 9 | 16 | 33 | 61 | -28 | 27 |
| 19 | Bordeaux | 31 | 5 | 11 | 15 | 41 | 71 | -30 | 26 |
| 20 | Metz | 31 | 4 | 11 | 16 | 28 | 57 | -29 | 23 |
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