Martesacker tells teammates that they should be serious while in the lead.

Martesacker says that Arsenal must learn from the mistakes in the games against Andelecht and swansea and start playing serious "football" to get their season back on track. Arsenal drew against Andelecht despite being 3 goals up. They threw up another lead against swansey. Gylfi Sigurdsson and Bafetimbi Gomis struck late on to give Swansea a 2-1 victory and leave Arsene Wenger's side with another hangover. What are your views?