Arsenal coach Mikel Arteta was absent when the club's first team returned to training at London Colney on Monday.
Most of the players on the first team trained at the club's Hertfordshire base on Monday morning, after the club decided it was safe to open their large training base.
Arteta and his first team were not present at the training, opting to stay at home.
Arsenal imposed strict rules for all players, assigning each individual his own ball and parking space, so that they do not come into contact with another person.
Players were assigned designated times to arrive and arrived in groups of five to contain the flow of players through the door. The gym, canteen and indoor training center were closed.
Arteta tested positive for the deadly coronavirus in March, forcing the postponement of the game between Arsenal and Manchester City and postponing the suspension of the Premier League.
Last week, Nicolas Pepe, David Luiz and Alexandre Lacazette were warned by the club after being seen disrespecting social distance measures.
Arsenal are the first club to open their training ground, but others must follow West Ham, Chelsea and Liverpool considering the move.
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