The new signing from Rangers attended the Canaries' fixture against Ajax wearing a protective boot and Carrow Road boss Chris Hughton confirmed that the defender will not be fit for the start of the campaign but admitted his relief that the injury will not keep Whittaker out long-term.
"It's certainly going to keep him out for a good few weeks," the recently appointed manager told BBC Radio Norfolk.
"The good news is that whenever anybody goes over on an ankle, you're always dreading the fact that it's something that might be a really long-term injury, but it's not to that degree which we're delighted at.
"You only have to pick up the newspapers to see players have picked up injuries in pre-season that will keep them out for a matter of months.
"It's part and parcel of the game, you just hope you can get through a pre-season with minimal injuries and at the moment we're OK."
Hughton was also delighted to give another recent signing at Carrow Road, Robert Snodgrass, a run-out against the Eredivisie champions.
He added: "When a player moves from one club to another at this stage, they'll generally miss out on a few days' training because they need to sort a few things out and that's been the case with him - and Michael Turner [who joined the club from Sunderland last Friday].
"He's come in late to our pre-season and missed some of the work that we've done, so it was good to get him on."
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