Rosler believes there is still more to come and plans to speak to Chelsea about a longer deal, possibly even bringing him back next season.
"George Saville has fulfilled our expectations," Rosler told the Fulham Chronicle.
"He is a great player and can be even better - there's great potential in him.
"He's hungry and he likes it here. We'll try to do something in January and maybe in the summer as well."
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