Gunners boss Arsene Wenger said on Sunday that Sanchez's return to the squad was delayed due to illness, prompting some scepticism from supporters, per Mattias Karen of ESPN.
However, the club's Twitter account posted this snap of the Chilean on the pitch on Tuesday as expected:
Simon Mullock of the Sunday Mirror had reported that Sanchez is ready to ask for a move to City. According to Julien Laurens of the Guardian, PSG want to sign the Chilean and Barcelona forward Neymar.
Sanchez's involvement in the Confederations Cup with Chile this summer meant he was due an extended break from action, and he's not been involved in any of Arsenal's pre-season fixtures so far.
The Gunners will be in action on Sunday at Wembley against champions Chelsea in the Community Shield, although Sanchez will be a major doubt for that encounter. The same goes for the team's opening Premier League game of the season against Leicester City on Friday, Aug. 11.
At this point, with speculation swirling over his future, Arsenal supporters would be delighted if Sanchez were on the club's books by the end of the transfer window.