Abraham scored twice in victory over West Ham in midweek.
Abraham now boasts 20 goals in 47 Premier League appearances, with five strikes so far this term.
"I'm very pleased with his form, and Tammy offers a lot," said Lampard.
“We saw that the other night against West Ham and we've seen that this season whenever he's played.
“Tammy and Olivier Giroud have offered us a lot in their own way at different times.
“Now he just has to keep working and keep progressing.
“Last season was a great, real breakthrough season for him in terms of Premier League and being Chelsea's number nine, and there's more work he can do.
“I'm very happy with him."