BOSS Ralph Hasenhuttl says Saints will have to take care to ensure Stuart Armstrong avoids any further injuries.

The Scot played a key role in Thursday night's 2-0 win over Wolves in the FA Cup, scoring to seal victory late on.

Armstrong has featured in all-but-five of Saints' matches this season, picking up a couple of knocks along the way including a muscle problem which ruled him out of last Saturday's defeat at Newcastle.

Discussing Armstrong's impressive performance at Molineux, ahead of Wolves visiting St Mary's in the Premier League tomorrow, Hasenhuttl told the Daily Echo: "Stuart was strong.

"For him, it’s always a little bit of a problem (to have) three games a week.

"But when we have enough time to prepare after one game, then he’s always good.

"He was injured, now we must really look that he stays fit."

Armstrong has scored four goals for Saints this season and signed a new three-and-a-half year deal with the club last month.