Premier League clubs voted unanimously on a return to full-contact training after a meeting on Wednesday. The decision marks the implementation of stage two of Project Restart, as the league continues to target a return to competitive fixtures in mid-June.
Manchester United and Manchester City were given permission to return to training while enforcing social distancing rules last Monday.
United returned to training in groups of no more than five last Wednesday, while City's players began work at the CFA on Saturday.
United and City haven't played a domestic game since March 8, when the two sides contested the Manchester derby at Old Trafford.