Bloodstains on the leg of Shane Watson's trousers during the Indian T20 League final as he scored a blistering 80 for Chennai were revealed to be from a cut that needed six stitches when he finished.

AFP / Noah Seelam

The 37-year-old Australian batsman was on the losing side in the end, but teammate Harbhajan Singh hailed Watson's courage in continuing to play despite suffering a gashed knee while diving for a catch.

"Respect brother what a LEGEND @srwatson33 given sweat, blood and everything for the team.. INSPIRING," Singh wrote on Instagram.

The Indian off-spinner posted a picture of Watson with blood-stained yellow trousers while batting in the Twenty20 final against the Mumbai, and said the opener needed six stitches after the valiant innings.

"Can you guys see the blood on his knee.. He got 6 stitches after the game," Harbhajan wrote.

"Got injured while diving but continue to bat without telling anyone," the bowler added.

Watson smashed 80 off 59 deliveries only to see his team lose by one run.

Watson was run out going for an unlikely second in the final over, and Mumbai paceman Lasith Malinga denied Chennai the two runs needed off the last ball to win the game and a record fourth title.

Watson's return to the Indian T20 League next season remains uncertain. He has already bid farewell to Australia's Big Bash T20 tournament, and Chennai captain M.S. Dhoni indicated he would make changes to the batting lineup for next year.