Kepa has been missing for the last three games, with Willy Caballero preferred.
"I have to consider the state of form of both goalkeepers, as in all positions. It is a recent change, nothing is definitive," said Lampard. "The unity must be maintained and his support for Willy has been very good.
"I am totally in tune with the club and the board. All we want is the best for the team and they pay me for making decisions.
"What Kepa needs is to train and show a great attitude, as I demand from the rest of the players. Things can change."
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