Fairfax Media reported on Monday the reigning WNBL most valuable player had secured a release from her contract in Hungary, and the Capitals were deep in negotiations to snap up their incumbent captain.

On Tuesday, scans confirmed her injury, which means the club can only play her on limited minutes.

The 26-year-old may miss games which involve long flights early on to avoid aggravating the problem.

Bishop attended training on Tuesday, where her teammates were informed of her signing, and the Capitals will make an official announcement on Wednesday.

Capitals coach Carrie Graf said the lighter workload in the WNBL compared to Europe should ensure Bishop gets through the season unscathed.

"Our season isn't like Europe where they have three games a week and practise twice a day, it's 24 games across five months," she said.

"She's in a program where she can be well managed, we can reduce her minutes at practice."

The Capitals were reeling after the late withdrawals of Belgian centre Ann Wauters and point guard Kathleen Macleod, but have effectively improved their roster by luring Bishop and WNBA guard Renee Montgomery.

"You're not just getting the MVP of the league [Bishop], we're getting one of our own players back that knows our program, plus a WNBA player of Renee Montgomery's ilk," Graf said.

"Arguably those are two better recruits than the two we had, in terms of fit for our team and not having to adjust too much.

"To be five weeks out from the season without a starting point guard or post was pretty damn scary, but sometimes out of adversity comes great things.

"We may have some growing pains early but there's a sense when we add some bigs we can make a real splash in the league this year."

Meanwhile, Graf said star Australian Opals centre Lauren Jackson is "tracking very well" in her rehabilitation from knee surgery and while there's no set time frame, expect her back on court early in the season.

Jackson has been training hard in a heat chamber and will form an outstanding post partnership with Bishop.

The Capitals won five of the six games Jackson played last year when she wasn't close to full fitness.

"She's confident and feels really good about the knee, she's got the best base she's had in a couple of years and they're really confident the surgeries have got everything in the right place," Graf said.

"She's doing conditioning in the heat chamber, and it'll be heat chamber minus oxygen next week.

"It's about building her workload, what we don't want to do is bring her back too soon."