ESSENDON forward Travis Colyer has been forced out of training after developing some inflammation in the sesamoid bone in his right foot.
The Bombers have placed the speedy forward in a moonboot and expect him to be sidelined for up three weeks before he can start to build up his program again.
High performance manager Justin Crow said the Bombers were not taking any risks with Colyer's injury.
"Trav had some sesamoid pain," Crow told the club's website.
"The sesamoids are a couple of little bones under your foot that can become painful.
"We want to settle that down, so we've got Trav in a boot.
"He'll stay in the boot for three weeks now and he'll come out of that hopefully with the sesamoid settled and then he'll build back up again."
The sesamoids are two pea-shaped bones located in the ball of the foot, beneath the big toe joint, and provides the leverage for the big toe when it pushes off during walking and running.
Colyer played 22 games for Essendon in 2017 and enjoyed his most consistent season in the Bombers' line-up, averaging 16.7 disposals per game.
In better news, star defender Michael Hurley is ready to enter the next phase of his recovery after surgery on his wrist and hip at the end of the season.
"Michael Hurley has had a good pre-season," Crow said.
"He'll be in some match play on Friday and we're really happy with how 'Hurls' is going."
The Bombers are in match preparation for their upcoming pre-season games in February, and on Friday their session involved two quarters of traditional match-play and two quarters of AFLX.
Others to go under the knife following the conclusion of the season included David Myers (finger) and Matthew Leuenberger (shoulder).
Crow said Myers' program had been hardly disrupted, while Leuenberger had shown some good progress.
"We had that (finger) operated on and that hasn't affected David's pre-season at all," Crow said.
"He's actually got in the majority of training both pre- and post-Christmas and he's in a really good place.
"Leuenberger had that shoulder operation and he's just come up to four months post-surgery now.
"He's worked through contact progressions in competitive training drills and elements of match play so he's progressing really nicely and has a good training base."
Josh Green is also tracking in the right direction after surgery on his foot in August.
Jones suffered a 'Jones fracture' – a break between the base and middle part of the fifth metatarsal of his foot.
He sustained the same injury during his time at the Brisbane Lions to his opposite foot.
"That's gone really well and it's actually good enough where Josh has been able to join in most of pre-Christmas training and he's got a good base behind now," Crow said.
Young forward Aaron Francis had a slight setback after developing soreness in his hip flexor, more specifically the psoas bursa in his hip.
"That usually responds well to cortisone and rest so we'll see him back running if not Friday, on Monday and we'll take a slow and steady approach to make sure we get that right," Crow said.
Jackson Merrett (broken leg) and Ben McNiece (neck) are back up and running, while young defender Jordan Ridley is around a month from full training after surgery on a syndesmosis ankle injury in December.
"He's four weeks post-injury now," Crow said about Ridley.
"He's been out of the moon boot for a week, walking around.
"He'll be doing some AlterG (treadmill) running later this week we hope and is on track, at the moment, for full training around JLT 1."