The rugby community continues to join forces to get behind Lealiifano after news broke last week of the diagnosis that left teammates, opponents and fans devastated.

The outpouring of support for Lealiifano was epitomised by the Wallabies players, including Israel Folau and Scott Sio, who used their day off to drive from the Central Coast to the capital to visit Lealiifano in hospital.

Former Brumbies skipper and Wallabies back Matt Giteau has also taken time out of his schedule to return to the capital to see Lealiifano.

Brumbies players say Lealiifano will be at the front of their minds whenever they train or play over the coming months as the club's leader starts treatment.

Brumbies have been visiting Lealiifano in between training sessions and his situation will add extra motivation to the players lining up in the John I Dent Cup grand final on Saturday.

Several Brumbies will take their place in the grand final clash between the Queanbeyan Whites and Tuggeranong Vikings, and Robbie Coleman says Lealiifano won't be far from their thoughts.

"It definitely hit hard when we heard the news," Coleman said.

"He's in great spirits as Christian always is. He's our captain [at the Brumbies] and we'll always be playing for him, regardless of a setback like this.

"I have no doubt he'll fight it like he has with any setback in his life and we'll here every step of the way.

"He's our leader and we'll support him as best as he can. Everything is going positively at the moment.

"He's still got a smile on his face and is still telling his bad jokes ... but to see everyone rallying around him is great."

Lealiifano has been inundated with messages of support from around the world as he begins a stint in hospital and faces an uncertain period.

Players including Folau, Sonny Bill Williams and Dan Carter sent their support while basketballers, rival teams and countries and other sports stars all passed on their best wishes.

Folau posted a photo on Twitter of the Wallabies fullback holding Lealiifano's son, Jeremih, after making the trip to Canberra.

The Brumbies players and officials have been by Lealiifano's side throughout his battle and his teammates are popping in for regular visits.

The squad was hit hard by the news last week when they were contacted by Brumbies staff before a public announcement was made.

"I remember starting at the Brumbies in 2008 and Christian has always been a leader in some sense because he can communicate with everyone," Coleman said.

"It's been great to play under him and in my eyes he's always a leader and a great Brumby. We're all behind him, he's taking this head on and he's going to be back better than ever.

"I can't wait to pull on a jersey with him ... he's just the same old Bruz that we always expected. He's an all-time great Brumby and just an absolute awesome person.

"He's inspiring everyone. It's a terrible thing to happen but we'll be there behind him the entire way.

"The Brumbies are like a family and that's a big credit to Christian because he has always gone out of his way to make everyone feel comfortable whether you're the youngest and oldest.

"We've got a family squad, we look after each other and that's what we'll continue to do."

Meanwhile, the Canberra Vikings named a strong National Rugby Championship squad on Wednesday with young gun Nick Jooste set to get a chance to take the flyhalf reins for the season.

Anyone wishing to send their support to Christian Lealiifano can leave a message at brumbies.com.au/message-for-christian/