The Bundesliga outfit recently rejected a bid of over €20m for the 21-year-old and a member of the backroom staff has declared that his staying is positive for the club
The Blues have had a long-running interest in the Germany forward, and recently had a bid in excess of €20m turned down by the BayArena outfit.
However, the 40-year-old is adamant that the Werkself require a player of Schurrle's quality if they are to progress, and voiced his hope that he will be around to help them reach their targets.
"Andre is not the one with something to prove," Lewandowski told Bild. "The fact that he's staying is a positive sign for everyong. We have huge goals, and we want to achieve them with him."
The club's sporting director Rudi Voller added that the offer implied that Schurrle would only get better and that he hoped that would occur together with Leverkusen.
"Such an offer has to be enough of an incentive for him to get even better," he said. "Andre has a four-year contract. We are glad we have him. He still has great potential for development."
Schurrle has already represented Germany on 16 occasions and has scored seven international goals.