Alexis Sanchez remained hot but Arsenal didn't convert some good chances and fell 2-1 to Everton at Goodison Park.
All eyes were on Arsenal's hat-trick hero Alexis Sanchez in a 5-1 win against West Ham at the Olympic Stadium.
Alexis Sanchez scored a brace as Arsenal edged past Bournemouth 3-1 at home on Sunday.
Arsene Wenger still hasn't committed to Alexis starting at Old Trafford on Saturday but it seems likely that he will.
Alexis Sanchez shook off a hamstring injury to score a brace as hosts Chile beat Uruguay 3-1 in World Cup qualifying on Tuesday.
Alexis will be available to Chile for their qualifier against Uruguay on Tuesday after missing the match against Colombia on Thursday with a minor injury.
The Chilean Football Federation have released a statement confirming Alexis Sanchez suffered a "low-grade muscular injury" in training.
Arsenal could face some time with Alexis Sanchez out injured after reports from Chile indicated that he might miss at least one of the upcoming international fixtures with a calf issue.
Alexis Sanchez scored a goal and recorded an assist as Arsenal disposed of Chelsea at the Emirates, 3-0.
Alexis had an active day with two goals and a missed penalty as Arsenal cruised past Hull City 4-1.
Arsenal will assess a number of players ahead of the trip to Hull after coming through a bruising and hard fought Champions League encounter in the Parc des Princes on Tuesday.
With Olivier Giroud still coming back from his summer exertions, it seems likely that Alexis Sanchez will line up as a central forward for the third week in a row at Watford.
Arsène Wenger has confirmed that Alexis Sanchez and Aaron Ramsey will be a part of Scandinavian touring squad this week following an extended summer break.
Alexis Sanchez wasn't on the field for penalties but he and his teammates won the Copa America for the second consecutive summer in penalties over Argentina.