A controversial penalty helped Danny Welbeck to a brace as Arsenal overcame a scare to beat AC Milan 3-1 on the night and 5-1 on aggregate to reach the quarter-finals of the Europa League.

Leading 2-0 from the first leg at the San Siro, Arsene Wenger's men found themselves behind to a superb Hakan Calhanoglu strike 10 minutes before half-time.

But any momentum Milan were building up dissipated when one of the additional assistant referees indicated Ricardo Rodriguez had fouled Welbeck when contact was minimal at best.

On the day he received an England recall, Welbeck made no mistake form the spot to score his first European goal since a hat-trick against Galatasaray in October 2014.

Milan continued to ask plenty of questions until a dreadful error from their goalkeeping protege Gianluigi Donnarumma meant Granit Xhaka's speculative strike put the overall result beyond doubt and Welbeck struck again in the 86th minute.