Greater Western Victoria Rebels' trio Jamieson Ballantyne (Portland), Hamish Sinnott (Camperdown) and Josh Rentsch (Penshurst) are working on their pace, endurance and agility ahead of the testing day.

Rebels talent manager Damian Ross believes the teenagers, who all played for Vic Country earlier this year, showed their traits at NAB League level and warranted invites.

Ballantyne is a student at Portland Secondary College student who often drives to Warrnambool and then Ballarat for training and back.

Ross said the seven-hour round trip spoke volumes of the midfielder-wingman's commitment.

"I'd say it's been a breakout year for Jamo," he told The Standard.

"You overlay that with the sacrifices he makes to come from Portland to play for the Rebels, it's pretty encouraging.

"I think it demonstrates a lot of the non-footy characteristics about commitment, resilience.

"He is very balanced Jamo, both feet are on the ground."

Ballantyne has played 10 matches, collecting a season-high 28 disposals against Gippsland Power.

Ross said he had a number of tricks.

"He moves really well, he covers the ground well, he's got good speed, good skills and he's very elusive," he said.

"He can navigate in and out of traffic really well and he also links up well.

"The role he plays as an outside mid-wingman means he helps connect the ground."

Rentsch, who turns 18 later this month, is a powerful presence at 197 centimetres.

Ross said the Ballarat Grammar boarder had diversified his game attributes in 2021.

"Josh has the big size and shape about him and he's shown great agility as the year's unfolded," he said.

"He was predominantly a forward for the first half of the year and he kicked a good bag against Eastern Ranges.

"He's showed he's capable of being super competitive as a key forward and capable of kicking goals.

"We've thrown him into the ruck and he's also shown agility to be super competitive as a ruckman and to get around the ground and use his strength to his advantage."

Rentsch is proving just as effective off the field.

"He's been a great leader for us. He's in the leadership group and has helped really shaped this group which is really important," Ross said.

Sinnott's potential has piqued clubs' interest, according to Ross.

The 183-centimetre teenager, who doesn't turn 18 until November, can play at half-back or on a wing.

"He's had really good moments and played some nice footy," Ross said.

"From rounds three to six he had a really nice period and that earned him a look at Vic Country level.

"Being that age, a young 18, clubs would see some upside in Hamish.

"He's got a good athletic profile.

"He covers the ground well and he does read the flight of the footy very well.

"He is a left-sided player and has good skills."

Ross said a minimum of three AFL clubs had to express interest for a player to be invited to the combine.

The AFL draft is one November 24 and 25. The first round will be called on the opening night with the remaining picks announced on night two.