The Liverpool boss says the forward will need time to settle, and can do the job he was brought in to do.
After securing his dream move to his boyhood club, Lambert didn't have the most memorable pre-season tour in the United States, which included a penalty miss in the 2-0 against AC Milan.
But Rodgers has backed Lambert to perform for the Reds when called upon.
The Liverpool boss is quoted in the Liverpool Echo, saying: “I think with Rickie it’s just the adaptation period of coming into a new club.
“There are new pressures and he’s still getting his fitness. A lot has happened to Rickie in a short period of time – moving his family up, travelling away, getting used to the players and how we work.
“I have no doubts about Rickie. He knows he’s not going to play every week but he will play a specific role for us in certain games. I’m sure he will do that really well.”
If nothing else it's an admittance that Lambert will be a rotation option, and if Liverpool are to play with two strikers in most cases then the club are searching for someone else to partner Daniel Sturridge.
The 32-year-old is evidently prepared to be rotated and used as an alternative option off the bench if things are perhaps not going so well for Liverpool.
With the amount of games the club will expect to play this season, Lambert will have plenty of time to prove his worth. Though he hasn't got off the mark in pre-season, he will have rather missed chances in pre-season games rather than when the pressure is on in Premier League and Champions League games.