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The 31-year-old defender has been sidelined for almost two years with a serious knee injury.
Reid, who has played 223 times for the Hammers, is the club's longest-serving player behind captain Mark Noble.
He will join up with Sporting Kansas City ahead of their new campaign which gets under way next month.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Inter MiamiInter Miami | 12 | 7 | 3 | 2 | 32 | 18 | 14 | 24 |
| 2 | FC CincinnatiCincinnati | 11 | 6 | 3 | 2 | 13 | 9 | 4 | 21 |
| 3 | Toronto | 11 | 6 | 1 | 4 | 14 | 14 | 0 | 19 |
| 4 | New York Red BullsNY Red Bulls | 11 | 4 | 5 | 2 | 16 | 16 | 0 | 17 |
| 5 | Columbus Crew | 10 | 3 | 6 | 1 | 12 | 9 | 3 | 15 |
| 6 | Philadelphia UnionPhiladelphia | 10 | 3 | 5 | 2 | 19 | 16 | 3 | 14 |
| 7 | DC United | 11 | 3 | 5 | 3 | 16 | 17 | -1 | 14 |
| 8 | Charlotte FCCharlotte FC | 11 | 4 | 2 | 5 | 12 | 13 | -1 | 14 |
| 9 | New York City FCNY City | 11 | 4 | 2 | 5 | 11 | 12 | -1 | 14 |
| 10 | Atlanta UnitedAtlanta | 10 | 3 | 3 | 4 | 14 | 11 | 3 | 12 |
| 11 | CF MontrealMontreal | 10 | 3 | 3 | 4 | 13 | 20 | -7 | 12 |
| 12 | Nashville SCNashville | 10 | 2 | 5 | 3 | 14 | 18 | -4 | 11 |
| 13 | Chicago Fire | 11 | 2 | 4 | 5 | 11 | 19 | -8 | 10 |
| 14 | Orlando City | 10 | 2 | 3 | 5 | 11 | 18 | -7 | 9 |
| 15 | New England RevolutionNew England | 10 | 2 | 1 | 7 | 7 | 18 | -11 | 7 |
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Real Salt LakeSalt Lake | 11 | 6 | 3 | 2 | 18 | 9 | 9 | 21 |
| 2 | Minnesota UnitedMinnesota Utd | 10 | 6 | 2 | 2 | 17 | 11 | 6 | 20 |
| 3 | Los Angeles GalaxyLA Galaxy | 11 | 5 | 4 | 2 | 21 | 17 | 4 | 19 |
| 4 | Vancouver WhitecapsVancouver | 10 | 5 | 3 | 2 | 18 | 10 | 8 | 18 |
| 5 | Colorado RapidsColorado | 11 | 5 | 3 | 3 | 18 | 15 | 3 | 18 |
| 6 | Austin FCAustin | 11 | 4 | 4 | 3 | 14 | 13 | 1 | 16 |
| 7 | Los Angeles FCLos Angeles | 11 | 4 | 3 | 4 | 19 | 19 | 0 | 15 |
| 8 | Houston DynamoHouston | 10 | 4 | 2 | 4 | 9 | 10 | -1 | 14 |
| 9 | St Louis City | 10 | 2 | 7 | 1 | 15 | 14 | 1 | 13 |
| 10 | Sporting Kansas CityKansas | 11 | 2 | 5 | 4 | 18 | 19 | -1 | 11 |
| 11 | Seattle SoundersSeattle | 11 | 2 | 4 | 5 | 13 | 13 | 0 | 10 |
| 12 | Portland TimbersPortland | 11 | 2 | 4 | 5 | 20 | 23 | -3 | 10 |
| 13 | Dallas | 10 | 2 | 2 | 6 | 10 | 15 | -5 | 8 |
| 14 | San Jose EarthquakesEarthquakes | 11 | 2 | 1 | 8 | 17 | 26 | -9 | 7 |
