The 19-goal striker suffered a hamstring injury while on international duty with Northern Ireland recently but managed to feature in Good Friday's goalless draw at Yeovil.
Struggling to play twice in four days, Grigg missed the 4-0 rout of neighbours Coventry on Monday and remains unlikely to feature this weekend as the Blades come to town for an encounter between two in-form promotion rivals.
Manager Dean Smith has no other injury or suspension problems and, should influential striker Grigg not be available, is almost certain to keep faith with the same starting XI who brushed aside Coventry with ease.
The Saddlers, on a 12-match unbeaten run, are just three points off the play-off places in League One.M
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