A ninth place finish is the best that St Mirren can hope for, while Rangers can go level with Celtic.
Buddies looking to dent Gers' title challenge
A ninth place finish is the best that St Mirren can hope for, while Rangers can go level with Celtic at the top.
Saints have enjoyed a fine end of season run-in, losing just two of their last 10, and could move above Inverness Caledonian Thistle with a win.
Rangers looked odds on to take the title a few weeks ago, but only two victories in their last seven has handed the advantage back to their Glasgow rivals.
Walter Smith's side are paying the price for a fixture backlog caused by their quadruple-chasing exploits and are preparing for their second game in three days, after picking up a 1-1 draw at Motherwell on Saturday.
Unchanged
St Mirren are expected to name an unchanged squad for their final SPL match of the season.
Gus MacPherson is missing full-back David van Zanten, who has played his last game for the club.
He will join Hibernian in the summer and will sit out against Rangers as he recovers from a knee operation.
Suspended
Rangers defender Carlos Cuellar will miss the crucial contest through suspension.
The Spaniard has gone through the disciplinary points threshold and is banned for one match.
Sasa Papac may return following a thigh strain but Allan McGregor, Chris Burke (both ankle) and Steven Naismith (knee) are all still missing.
