New signing Edouard Mendy could make a shock return from injury against Sevilla.
The Senegal international picked up a thigh injury with the national team and missed the 3-3 draw with Southampton.
The 28-year old goalkeeper was signed from Chelsea’s Group E opponents, Rennes, last month for around £22million.
He was bought as a replacement for Kepa Arrizabalaga who has already made three mistakes this season after a disappointing display of performance last season.
Mendy trained with the first-team squad at Cobham yesterday and is in contention to feature against Sevilla.
“In terms of the goals conceded, yes I am aware of the stats,” said Lampard.
“The other stat is, since we have been here, we have conceded the second least shots in the Premier League behind Manchester City, so sometimes it helps you to narrow down some of the issues.
“And the issues are that we don’t concede too many shots on goal, but when we do we concede goals.
“It’s something we are aware of, we were aware of when you look at our recruitment.
“More important than that, we work everyday with the players on the pitch to make sure we set up well to not concede many chances, but the chances we do concede we let in too many [goals] and that is something we work on specifically.
“Of course, we want to concede less goals, as all teams do at the moment.