The on-loan Chelsea midfielder impressed again in the 2-1 win over Hull.
Mount has shone so far in the Championship and netted in the Rams' 4-0 Carabao Cup win over Hull at the KCOM Stadium on Tuesday.
Hull starved him of possession this time around but Lampard praised Mount's work rate.
"They know Mason is a big threat and they tried to nullify it. We know Mason is going to have a big future."