What happened: The 31-year-old tore a hamstring and exited eight minutes into Saturday's 1-0 win over Motherwell. He had scored three goals across his previous two matches.
Why it matters: The absence With Youssef Chermiti also sidelined, Ryan Naderi, Bojan Miovski and Kevin Kelsy carry the scoring burden.
By the numbers: Shankland has averaged one goal every 146 minutes since the start of last season, compared with 148 for Miovski, 189 for Naderi and 190 for Kelsy.
What to watch: Rangers host St Mirren on Wednesday before facing Celtic in consecutive cup and league fixtures.