Former Australian Test bowler Brett Lee will retire from all forms of cricket at the end of the current Big Bash League campaign.

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The speedster made the announcement at the Sydney Cricket Ground on Thursday, having decided before the 2014-15 season this would be his last.

"It's been an amazing and emotional 20 years and I've enjoyed every single moment of it," the Sydney Sixers star told reporters.

"I didn't bother to do the math on it, but it's a lot of ice baths, a lot of training sessions, a lot of cricket balls bowled, there's a lot of flights.

"But there's also been a fun."

The 38-year-old called time on his international career in July 2012, but has been a Twenty20 regular – both in the BBL and the IPL – in the years since.

Next Thursday's final-round BBL clash with cross-town rivals Sydney Thunder at the SCG could be his swansong if the Sixers don't win to secure a playoffs berth.

"After this year, there won't be any more cricket," he said.

"I'm excited, I'm emotional, I'm happy, but I'm certainly not worried because I know that I've made the right call.

"I've certainly had a lot more fun in the last six weeks than I've had in my life, because I haven't put any pressure on myself."

Lee remains the equal leading wicket-taker for Australia in one-day internationals alongside Glenn McGrath, with 380 in 221 appearances.

He also claimed 310 scalps in 76 Tests for Australia.