“There is no confirmation around that (retirement),” Lockyer said.
“He is on a break at the moment and at this stage we’re hopeful that (retirement) is not the case.
“We will know more in the coming weeks.”
However, Lockyer conceded Gillett – who is contracted with the club until the end of 2022 – was still speaking with medical staff about his future.
“Of late, his body hasn’t withstood the pressures of playing NRL, Origin and for his country,” he said.
“Gillo is still out there with some decisions to make but at this stage (retirement) can’t be confirmed.
“As far as I know he is still talking to the doctors now about what his future looks like.”
Gillett this year successfully returned from a broken neck to regain Queensland selection but finished the season troubled by a lingering shoulder complaint.
He also missed the 2019 State of Origin decider with a knee injury and was later sidelined with a back complaint before picking up his shoulder niggle at the end of the season.
He battled on to play his 200th NRL game – Brisbane’s disastrous 58-0 elimination final loss to Parramatta.
Asked if Gillett’s retirement would be a big loss, Lockyer said: “No doubt. The guy has had a great career with us and is a great bloke.”
But Lockyer was hopeful Gillett would regain full fitness, saying the veteran would be in the 2020 Broncos captaincy mix.
Darius Boyd’s future as skipper is uncertain with coach Anthony Seibold to pick a new-look leadership group based on pre-season performance following their embarrassing NRL finals exit.
“If Gillo is available, he would (be in the captaincy mix),” Lockyer said.
“He has played for his country and his state. He has a great attitude and he has the qualities to be a leader.
“The way the season finished there was a lot of decisions about a lot of players’ positions in the team, everyone is taking a deep breath and we will get through the off-season.
“I think there are still some positions up for grabs there but it will be up to the players to prove who is most worthy.”