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Northampton coach Phil Dowson was optimistic Mitchell would recover in time for the game on 1 February, saying he believed there was "nothing structural" to the injury and it was a soft-tissue problem similar to a "dead leg".

Alvarez, who picked up a dead leg in the first half, was substituted after 54 minutes with Moyes having one eye on a hectic Christmas period for the Hammers.

The 20-year-old, nicknamed the Guernsey Grealish after an impressive performance for his old club in this same stadium last season, appeared to be running off a dead leg when he was confronted by Rodri in the City box.

Fellow new arrival Jeremy Doku has caught the eye but that has only drawn attention to Jack Grealish, who has only started two Premier League games this season, and none since he suffered a dead leg at Sheffield United in August so severe it left him on crutches.

The midfielder has struggled for game time since recovering from a dead leg last month, being named on the bench for the past four fixtures, but was backed by his manager who pre-match said he did not "have a piece of doubt about Jack".