ESSENDON speedster Alwyn Davey will miss today's Anzac Day clash with Collingwood after injuring his right knee at training yesterday.

Davey, who was an important player in last year's game, injured himself during a running drill.

Essendon team manager David Calthorpe said Davey would have scans on Monday.

"It's unfair to speculate on what he has done, but based on initial tests, we are quite concerned," Calthorpe said in a statement on the club's website last night.

Davey's replacement will come from emergencies Damien Peverill, Darcy Daniher or Nathan Lovett-Murray — the latter dropped from the side that lost to St Kilda last week.

Bombers forward Courtney Johns will make his season debut in today's game.

Collingwood welcomes back deputy vice-captain Nick Maxwell from a one-week suspension and midfielder Ryan Cook for Ben Reid (quad) and Brodie Holland (ankle).

Geelong's Ryan Gamble returns from suspension for tonight's game against Fremantle. The Cats have also named defender Harry Taylor, while ruckman Shane Mumford will make his AFL debut. Brent Prismall, Trent West and Max Rooke were all omitted.

Fremantle has named Des Headland and Ryan Murphy and dropped Scott Thornton and Matthew Carr.

Bryce Gibbs returns for Carlton against Adelaide at the MCG tomorrow. The Blues have also named Steven Browne and Adam Hartlett. Browne, from West Perth, was a third-round pick in last year's draft. The Blues omitted Adam Bentick and Setanta O'hAilpin, while Jordan Bannister will miss up to four weeks with a ruptured hamstring.

The Crows have brought in Chris Knights for Jarrhan Jacky.

Port Adelaide goes into tomorrow's match at AAMI Stadium unchanged, while St Kilda picked Shane Birss, Steven Baker and ruckman Michael Rix to replace Steven King (hamstring), Sam Gilbert (shoulder) and Clint Jones. Fraser Gehrig plays for the club's VFL affiliate, the Casey Scorpions, in Tasmania today.

Western Bulldogs midfielder Scott West returns from a knee injury to play against West Coast at Telstra Dome. The Bulldogs omitted Jarrod Harbrow.

The Eagles have named Brent Staker, who was on the end of Barry Hall's left hook in round four and missed last week's loss to Port Adelaide with concussion.

Brad Ebert, former Carlton forward Josh Kennedy and Will Schofield have also been brought in for Chad Fletcher, Mark Nicoski, Mark Seaby and Matthew Spangher.

North Melbourne has made two forced changes for Sunday's game against Sydney at the Telstra Dome, losing Leigh Brown with a hand injury and Daniel Pratt through suspension.

Jess Sinclair, Lachlan Hansen, Eddie Sansbury and Scott Thompson have been named in the expanded 25-man squad.

The Swans have named Tadhg Kennelly, Ben Mathews and Jesse White in their squad.

Veteran defender Joel Bowden has been named in Richmond's 25-man squad for Sunday's game against Hawthorn, while the Hawks have named Ben McGlynn, Cameron Stokes and Jarryd Morton in their expanded squad.