Scott Lucas (knee), Mark McVeigh (toe) and Jason Winderlich (back) all joined in the sweltering main session at La Trobe University after overcoming their respective complaints.
"It's well known our rehab group was fairly large back in November," Essendon football operations manager Paul Hamilton said. "But the conditioning and medical guys and the players themselves have been very diligent in making sure they return in reasonable nick."
Hamilton said the outlook for the trio was more focused on round one of the premiership season than early participation in the NAB Cup.
"With all these guys, if they've missed substantial periods this pre-season it is too high a risk to play them round one of the NAB Cup," he said
"You look to round one of the AFL season with these sorts of fellas and make sure they have got enough match practice in to ensure they are ready for round one."
Hamilton said it was pleasing to see Winderlich in particular back in training, with the 24-year-old enduring a follow-up back operation last year after a failed first attempt.
"He's had two back operations so it's pretty serious stuff," he said.
"There were a lot of concerns about him, but he's been building up since October and it's been a really graduated program. It's gone really well and he's now at the stage where he's ready to resume full training.
"That's really exciting because he's had a lot of heartache over the past few months, so from that point of view we're really pleased, and hopefully from here on he gets a good run."
He also said Lucas was looking and feeling good about his current state after an operation to clean up his knee during last season.
"He's been going along pretty well. The medical and conditioning staff just wanted to ease him into things, and that's what he did before Christmas," he said.
"He's really stepped it up since then and now he's doing full training. He hasn't missed a beat in terms of his rehab and he's feeling really confident, which is half the battle."
McVeigh has overcome a broken bone in his toe which he sustained in an innocuous training incident in November.
"He's an interesting one because he was looking terrific in the pre-season and he was one of the few players that actually picked up an injury in the course of the pre-season," Hamilton said.
"He had the break in his toe area and that's just gone to plan, so it's nearly six to eight weeks of full rehab and he's ready to go."
In other Essendon injury news, Hamilton said Scott Gumbleton (collarbone) and David Myers (foot) and Jay Neagle (ankle) were in full training after putting their injury concerns behind them.
Young gun Darcy Daniher is "not too far away" from taking part in the main session after battling a back problem, while the Bombers' knee reconstruction patients Alwyn Davey and Brent Prismall are tracking well.
"Davey is awaiting the surgeon's tick to say join in. He looks great and he's done everything except the full contact work," he said.
"Prismall has been very professional. He's a long way off but he's training well and you can just see the determination he's got."
Ruckman David Hille also participated in Wednesday's training session following minor surgery last week to remove a stingray barb from his leg after being stung in the waters of Albert Park.
"He's fine but he kept away from the beach on the weekend," Hamilton said.
"He's lucky because the barb didn't get into his muscle as that's when it has a greater effect. He's unlucky he got stung but he's lucky it didn't have any effect."
The big ruckman is not expected to figure in the NAB Cup, however, having already missed a month of pre-season training with a hamstring strain.
