Ghana and Arsenal midfielder Thomas Partey will undergo a scan on an ankle injury he sustained during Sunday's 2-1 pre-season defeat by Chelsea on Monday, August 2.
The 28-year-old was substituted after picking a nasty knock in their pre-season friendly defeat at the Emirates stadium.
He went under a strong challenge from Ruben Loftus-Cheek and could not continue the game.
According to Mikel Arteta, the injury is not looking good.
The Ghana international joined the English Premier League outfit last summer from Spanish La Liga side Atletico Madrid.
Although he had a bright start to life in the European country, various injury setbacks meant that Arsenal did not fully benefit from his quality in his debut season.
Last season, Partey made 33 appearances across all competitions and provided three assists in the process.