Arsenal v Olympiakos: We must win home games - Arsene Wenger

Arsenal manager Arsene Wenger says his side "must win" all their Champions League home games if they are to qualify, as they host Olympiakos on Tuesday.

Olympiakos have won the Greek title for the past five seasons and have won all their domestic league games so far.

Wenger also admitted the intensity and quality of the Premier League can make playing in the competition harder.