GETTY KNOCK: Perez has an injured knee Questions were asked on social media when the Spaniard was not named among the substitutes for this afternoon's clash. Arsene Wenger didn't suggest he had an issue at his Friday morning press conference.                 But the official Arsenal Twitter feed cleared it up by announcing he had a "slight knee injury." There was no word on how long he will be out for. Perez joined Arsenal in late August for £17m from Deportivo La Coruna. The 28-year-old has made just three appearances so far, scoring two in the 4-0 win over Nottingham Forest in the EFL Cup. He had been on the bench for their last two games against Chelsea and...
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