The 22-year-old racked up 50 appearances for the Ligue 1 side in his debut campaign at the club last time out and has been used 45 times so far this term.
Ndombele's form earned him his first call up to the France senior side last October and he has gone on to earn four caps.
Aulas would like to see Ndombele link up with Juventus, but he has warned them that they have to formalise their interest soon.
"It's true that Juventus are after Ndombele," he told Tuttosport. "But there's also PSG, Manchester United and City. I'd honestly like to see Ndombele at Juventus with [Miralem] Pjanic, a player we launched at Lyon and who I'm still very attached to.
"We'll see what happens. I won't talk about money. Economic parameters are the priority when selling players, but I'd like to sell him to Andrea Agnelli if all the offers were the same."