The Scotland international has been dealing with a calf problem for much of this season.
According to the Daily Echo, the Saints' Austrian boss said: "At the moment, as of today I had 21 players on the pitch working with us.
"It was only Stuey who was not part of the squad. Jack Stephens is back and all the other players.
"Thierry Small played with the under-23s, so he was not with us but the rest were with us."
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