Kovacic has shone in midfield in recent weeks.
Lampard said, "It is common place for foreign players coming to the Premier League to have period of settling in, that is normal.
"From Kovacic I thought there were some really good performances last year. The fact he was in and out the team is never easy but I do think he feels at home now. His personality shines through in the group and he is a very likeable character with a slightly, nice tough side to him on and off the pitch, and he is a really good player.
"Now the natural progression is scoring goals and we are working on that one. You might see a big smile if he scores, not just from me or him but from the group, because we know he has the quality to score and that will be the next step."