Alexis was forced off at West Bromwich Albion in our last fixture, with Arsène 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.