Sanchez did not board the team boss as his transfer saga looks like coming to an end over the coming days.
He stayed at home in London with his family as he mulls over a move to Manchester United.
And on the pitch things went from bad to worse.
Hector Bellerin put Arsenal in front after a dour opening 45 minutes.
But Callum Wilson and then Jordon Ibe turned the game on its head and left Arsenal travelling back up the M3 with their tail between their legs.
FULL REPORT TO FOLLOW