Arsenal snapped their poor form by turning in a commanding performance during their 3-1 win over Chelsea.
Down 2-0 at the break, forward Tammy Abraham got a consolation goal in a match which saw Jorginho missed another penalty.
“It was an opportunity to go second against a team that are having a tough time,” said Frank Lampard, whose side dropped to seventh, told Sky Sports.
“You either make it difficult for them or you give them a little opening and we did that from minute one and continued for 45 minutes. It was lazy to give away a penalty and lazy to give away a free kick that he (Xhaka) puts in the top corner.”
“We fought … but in the first half we gave ourselves too much to do… I’ll take responsibility on the outside but the players also have to take responsibility,” Lampard added.
“The message was clear, Arsenal are a dangerous team. When you go out and play 60% or 70% then you’re not going to win any Premier League games.”
Arsenal manager Mikel Arteta will be relieved after his side moved up to 14th.
Chelsea host in-form Aston Villa on Monday while Arsenal welcome Brighton to the Emirates on Tuesday.