Essendon has named six inclusions to an extended squad for Sunday's clash with the Western Bulldogs at Marvel Stadium.

The Bombers will make at least two changes for the round 21 clash, with injured duo Dyson Heppell (thumb) and Kyle Langford (hamstring) already confirmed outs.

Matt Guelfi, Cale Hooker, Martin Gleeson, Andrew Phillips, Alec Waterman and last week's medical sub Brayden Ham are in line to return, having been named on an extended bench.

Essendon's 26-man squad will be trimmed to 22, with the final team to be named at 5pm AEST on Friday.

The Bombers will be out to snap a six-game losing streak against the Bulldogs and stay in touch with the top eight, with the action to begin at 3:20pm and broadcast live on Channel Seven on Sunday.

ESSENDON'S ROUND 21 SQUAD:

Backs: Jayden Laverde, James Stewart, Aaron Francis
Half-backs: Mason Redman, Jordan Ridley, Nick Hind
Centreline: Tom Cutler, Zach Merrett, Nik Cox
Half-forwards: Devon Smith, Jake Stringer, Dylan Shiel
Forwards: Anthony McDonald-Tipungwuti, Peter Wright, Sam Durham
Followers: Sam Draper, Will Snelling, Darcy Parish
Extended bench: Martin Gleeson, Dylan Clarke, Matt Guelfi, Archie Perkins, Brayden Ham, Andrew Phillips, Cale Hooker, Alec Waterman

In: Guelfi, Hooker, Gleeson, Phillips, Waterman, Ham

Out: Heppell (thumb), Langford (hamstring)

Last week's medical sub: Ham (used)