Lucas will provide more of a defensive shield, giving Allen the chance to express himself more.
"I think you will see a different part of Joe's game," said Rodgers. "I am not sure whether you will see an improvement because I think he has been at a real high level.
"But you will see his flexibility in how he can play further up the field. He is really dynamic in that middle-to-final third and sometimes you see those little bursts when he breaks through and is exciting.
"Lucas is a player who is progressing really well. He is working very hard off the field to arrive back as quickly as he can.
"We had good news on his scan the other day and hopefully in the next few weeks he will be back and that will make us stronger."