Newcastle fear Joe Willock will miss their final two games after injuring his hamstring against Brighton.
A foot injury is likely to rule out Sean Longstaff, while Joelinton, Jacob Murphy and Kieran Trippier are doubts.
Leicester have accelerated Kelechi Iheanacho's rehabilitation from a groin issue in the hope he will be able to feature at St James' Park, manager Dean Smith said on Thursday.
Kiernan Dewsbury-Hall could also return from an ankle injury.
However, Smith says the midfielder, who had a pain-killing injection in the build-up to this match, is a "bigger worry" than Iheanacho.