Cotchin has been suffering from knee soreness and didn't pull up in time for the Round 7 battle.
richmondfc.com.au reports that he is joined on the sidelines by Dylan Grimes (foot), Ricky Petterd (calf) and Ty Vickery (concussion). Matt White has also been omitted.
Mature-age recruit Orren Stephenson will make his club debut. The ruckman spent 2012 on Geelong's list.
Nathan Foley, Shane Tuck, Jake Batchelor and Robbie Nahas are also back for the Tigers.
See the Power's three changes here
The Round 7 Richmond team
B: Morris, Rance, Chaplin
HB: Newman, Ellis, Houli
C: Grigg, Tuck, Jackson
HF: Deledio, S. Edwards, King
F: McGuane, Riewoldt, Martin
R: Maric, Foley, Vlastuin
IC: Knights, Batchelor, Stephenson, Nahas
Emerg: A. Edwards, Dea, White
In: Foley, Tuck, Batchelor, Nahas, Stephenson
Out: Cotchin (knee), Grimes (foot), Petterd (calf), Vickery (concussion), White
New: Stephenson (Richmond’s third pick in the 2013 AFL rookie draft)
