Arsenal fans are left baffled as boss Mikel Arteta brings Thomas Partey off for new £12million signing Jorginho just moments before Everton's winning goal.
The Ghana international was taken off in the 59th minute for the former Chelsea midfielder to make his debut.
Not even a minute later, Everton opened the scoring as James Tarkowski nodded home a corner to make it 1-0.
Fans have flooded to social media to question boss Arteta's decision just prior to Everton opening the scoring.
One fan said: 'Arteta was a little too eager to sub Partey for Jorginho.'
A second posted: 'Why take Partey out if he isn't injured?'
A third tweeted: 'If Arteta subs off Xhaka instead of Partey, we don’t concede that corner and therefore goal.'
A fourth chimed in, by saying: 'Just when Thomas Partey was sub, Everton take the lead. Partey’s impact.'
Another added: 'Arteta made the wrong sub taking Partey off. Xhaka needed to go out not Partey.'