Mikel Arteta has confirmed that Mikel Merino faces a spell on the sidelines after picking up an injury ahead of Arsenal’s Premier League showdown against Brighton & Hove Albion. Merino joined the club for a fee believed to be in the region of £32m earlier this summer and was in line to make his debut for the club this weekend. However, it now appears as if Arsenal fans will have to wait a bit longer to watch their newest arrival in action. Mikel Arteta says Arsenal new signing Mikel Merino has suffered possible fractureSpeaking at a press conference ahead of Arsenal’s trip to the Amex Stadium,…