Alexis was forced off at West Bromwich Albion in our last fixture, with Arsene Wenger commenting afterwards that the Chilean's ankle was "in an absolutely terrible state".
Nonetheless, he recovered in time to play twice for La Roja during the international break, drawing level with Marcelo Salas as Chile's record goalscorer in Tuesday night's 3-1 win over Venezuela.
So, what's the latest on Alexis' fitness?
"We got a message from him," the manager said at his pre-match press conference. "It was a kick, it was swollen.
"The only thing we didn't know was whether the ligament had been touched or not. It was just a kick. When the swelling and the bone bruising went down, he could normally play.
"I think personally he's happy here," Wenger added. "It's true that we have not extended his contract yet. I hope that he will stay at the club but overall I think you have as well to be very cautious when people give interviews in their home countries.
"As you said, the interpretation is not always exactly what they wanted to say. I don't see anything in that - he said he wants to win the championship, that's what everybody wants. I can understand that completely."
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