The Dutchman landed awkwardly after punching away an Adam Johnson free-kick and was immediately replaced by Rob Elliot in the second half.
It is not the first time Krul, who recently returned to action after missing a month due to an ankle injury, has had problems with his shoulder.
The 25-year-old suffered a similar injury when he was on loan at Falkirk in January 2008.
Source: Newcastle United Mad
Source: FOOTYMAD
