The on-loan Portuguese forward has accepted the two-match suspension he was given for using simulation to earn a penalty against Celtic last weekend.
Goncalves went over to win the spot-kick which earned St Mirren a point that day but he was subsequently charged with "causing a match official to make an incorrect decision by committing an act of simulation".
Buddies winger Gary Teale will be available for selection after recovering from the tight muscle which forced him off late on during the midweek draw at Kilmarnock but long-term absentees Thomas Reilly, David Barron and Darren McGregor remain on the sidelines.
Second-placed Motherwell have everyone available for the Fir Park contest, much to the delight of manager Stuart McCall.
"I can pick from a fully-fit squad, which is great," said McCall.
"Adam Cummins was sent off playing for the Under-20s but it is an Under-20s suspension he serves, so that's not a problem."