Ghana ace Thomas Partey was present on the first day of preseason exercise with Spanish outfit Atletico Madrid.
The Arsenal target went through some drilling on the first day of training at the Wanda Metropolitano.
Partey and the rest of his Rojiblancos teammates went through the mandatory test, with only two testing positive and have since been isolated.
Diego Costa and Arias are the two in quarantine, with the rest reporting at the Wanda Metropolitano to begin preparations for the 2020/21 season.
Players on international duty did not partake in training on Friday.
Thomas Partey, a target of English giants Arsenal, looks to put the speculations of the summer transfer window behind him as he prepares for the upcoming campaign.
The 27-year old had an outstanding 2019/20 season, helping the Madrid based club to finish third in La Liga and reach the quarter finals of the UEFA Champions League.
His performances has seen him attract interest across Europe, but he is yet to make a decision about his future.
Partey's current deal with Atletico expires in 2021.
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— Atlético de Madrid (@atletienglish) September 4, 2020