"So he's started running and then maybe he can start training next week," the Dutchman added.
Midfielder Jordi Gomez is also getting back to full fitness after recovering from knee surgery in the spring.
"Jordi is getting better and better," the manager said.
"He is improving, so in a couple of weeks he will be a member of the squad."
However, defender Adam Matthews has been ruled out for another four weeks after injuring his ankle in the 6-3 League Cup win against Exeter last month.
Sunderland face Tottenham Hotspur at the Stadium of Light in the Premier League a week on Sept. 13.
The Black Cats currently sit bottom of the table with just two points from their four league games so far.
(Reporting by Simon Jennings in Bengaluru; editing by Amlan Chakraborty)
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