The 22-year-old made 14 appearances for the Ladbrokes Premiership club.
A statement from the Paisley club read: "St Mirren Football Club can confirm that Matty Willock has left the Buddies and will return to his parent club, Manchester United.
"The club would like to thank Matty for his contributions and wish him well for his future career."
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 31 | 22 | 7 | 2 | 72 | 30 | 42 | 73 |
| 2 | Arsenal | 31 | 17 | 11 | 3 | 56 | 26 | 30 | 62 |
| 3 | Nottingham ForestNott'm Forest | 31 | 17 | 6 | 8 | 51 | 37 | 14 | 57 |
| 4 | Chelsea | 31 | 15 | 8 | 8 | 54 | 37 | 17 | 53 |
| 5 | Newcastle UnitedNewcastle | 30 | 16 | 5 | 9 | 52 | 39 | 13 | 53 |
| 6 | Manchester CityMan City | 31 | 15 | 7 | 9 | 57 | 40 | 17 | 52 |
| 7 | Aston Villa | 31 | 14 | 9 | 8 | 46 | 46 | 0 | 51 |
| 8 | Fulham | 31 | 13 | 9 | 9 | 47 | 42 | 5 | 48 |
| 9 | Brighton & Hove AlbionBrighton | 31 | 12 | 11 | 8 | 49 | 47 | 2 | 47 |
| 10 | Bournemouth | 31 | 12 | 9 | 10 | 51 | 40 | 11 | 45 |
| 11 | Crystal Palace | 30 | 11 | 10 | 9 | 39 | 35 | 4 | 43 |
| 12 | Brentford | 31 | 12 | 6 | 13 | 51 | 47 | 4 | 42 |
| 13 | Manchester UnitedMan Utd | 31 | 10 | 8 | 13 | 37 | 41 | -4 | 38 |
| 14 | Tottenham HotspurSpurs | 31 | 11 | 4 | 16 | 58 | 45 | 13 | 37 |
| 15 | Everton | 31 | 7 | 14 | 10 | 33 | 38 | -5 | 35 |
| 16 | West Ham UnitedWest Ham | 31 | 9 | 8 | 14 | 35 | 52 | -17 | 35 |
| 17 | Wolverhampton WanderersWolves | 31 | 9 | 5 | 17 | 43 | 59 | -16 | 32 |
| 18 | Ipswich TownIpswich | 31 | 4 | 8 | 19 | 31 | 65 | -34 | 20 |
| 19 | Leicester CityLeicester | 31 | 4 | 5 | 22 | 25 | 70 | -45 | 17 |
| 20 | Southampton | 31 | 2 | 4 | 25 | 23 | 74 | -51 | 10 |
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