St Kilda forward Tim Membrey is set to face Match Review Panel scrutiny for a late high hit on Richmond defender Dylan Grimes.
Membrey hit a marking contest late and collected Grimes in the head with his elbow.
Grimes initially played on but had to be mothballed at half time with concussion.
Watch the incident here:
The loss of Grimes compounds a horrible night for Richmond; they trail St Kilda 19.8 (122) to 4.9 (33) at three quarter time.