Danny Welbeck will be crucial to Arsenal run-in, says Per Mertesacker
England international Welbeck had not kicked a ball for the Gunners in 10 months but returned with an instant impact on Sunday, glancing home an stoppage-time winner to beat the Premier League leaders.
Leicester had taken the lead through a Jamie Vardy penalty, only to see Danny Simpson sent off early in the second half for two bookable offences.




