The Chilean has been on a break since winning the Copa America with his home nation.
Arsenal took to training yesterday, with the return of one of their best players the topic of discussion.
Alexis Sanchez was their star player last season after arriving from Barcelona in the summer and this campaign Arsenal hope he will be much the same.
He has been out of action recently after taking an extended break after helping Chile to win the Copa America in his home country last month.
He kept himself in shape during that time and he certainly looked to be, although at one point he really did look to be puffing – taking a seat and grabbing some breath before getting back into the action.
Another interesting point to note was that of Krystian Bielik’s presence.
The 17-year-old Pole, who signed for the club in January from Legia Warsaw, is yet to play a senior game for the club but is still training with the first-team as he did for much of last term.
Alex Oxlade-Chamberlain was also in action and looking in great shape after scoring the goal that beat Chelsea in the Community Shield last summer.