TEAM NEWS Arsenal defender Per Mertesacker is doubtful for Sunday's match against Premier League leaders Chelsea because of an ankle injury. Gabriel Paulista is ready to come at centre-half. Goalkeeper David Ospina as well as full-backs Hector Bellerin and Nacho Monreal are expected to return, having sat out last weekend's FA Cup semi-final against Reading at Wembley. Captain Mikel Arteta (ankle) and midfielder Alex Oxlade-Chamberlain (groin) are still not match fit. Chelsea boss Jose Mourinho will make a late decision on whether to risk Diego Costa's fragile hamstrings against Arsenal in a potentially decisive match in the Premier League title race.Costa has missed the last two matches,...
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