The midfielder, who joined on loan from Brentford during the winter transfer window, has quickly become an influential presence in midfield.
His performances have added balance and stability to the team in the crucial second half of the season.
Speaking to talkSPORT, Lampard said Onyeka brought exactly the qualities the squad required and has consistently delivered strong displays since his arrival.
“Frank has been brilliant,” Lampard said.
“He was a profile of a player we needed in that moment and he’s come in and given us everything we need, which has really helped the balance of our midfield with what Grimesy does and whoever plays in that 10, how they play.”
