However, he insists a move for the France U21 international this week is unlikely.
Soumare has emerged this season as among the most coveted young midfielders in the game, with Chelsea mentioned as potential suitors.
Asked directly about the youngster before Saturday's FA Cup win over Hull City, Lampard stated: "I'm aware of him as a player, but he is not on our radar for this window.
"We played against him, but he is not one on the immediate radar.
"He is a good player, but he is another club's player."