The Spaniard, who is now the club's second choice keeper, is out with a shoulder problem.
According to his manager, Kepa is now working with the coaching staff and is doing better.
But it is unclear if he will be available for their league game against Burnley at the weekend.
"Kepa is outside as I speak and has had some progression in his shoulder injury so we're hopeful but we'll see with that one," Lampard told reporters.
"In terms of the rest of the squad, we don't have any clear injuries but we do have a bit of a tired group.
"We arrived back quite late, in the early hours of this morning, so I'll have to assess everybody today and tomorrow to see how they've settled down and we'll see where we're at."
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