Souths badly missed injured hooker Issac Luke and with the New Zealand international set for a long spell on the sidelines, Maguire must find a way of picking up his side ahead of next Saturday's clash with St George Illawarra at the SCG.
The second half started positively for the Rabbitohs when Dylan Walker and George Burgess scored in quick succession to reduce the deficit and there were hopes of a fightback when Nathan Merritt looked to have scored a historic try.
However, an offside call by the video referee against Sam Burgess denied Merritt the chance to finally break Benny Wareing's try-scoring record of 144 that's been held since 1933.
That setback appeared to knock the stuffing from the hosts and Jack Wighton iced the victory when he latched onto a Terry Campese kick and ran underneath the posts.
Jarrod Croker then kicking the extras, before adding a penalty from close range.
Souths did have the final say when Chris McQueen scored on the siren, but it merely papered over the cracks on a disappointing afternoon for the home side.
-AAP