Crusaders coach Scott Robertson revealed that the veteran played in the final with a hand injury.
"He's got an incredible capacity to play through pain…to play with a broken thumb. Last week he definitely wasn't right because he never says he's not right and he sort of hesitated.
"This week he was so on. He was a commander-general. He worked so well with Scooter (Scott Barrett). The performance was a throwback to his best," Robertson said on arrival in Christchurch today.
Whitelock's injury comes after fellow All Blacks lock Josh Lord was ruled out for the season after being named in the 36-man squad earlier in the week.
Lord had an MRI scan during the week which revealed an ACL rupture, ruling him out for the rest of the All Blacks 2022 season.
Whitelock and Lord were among five locks named in the All Blacks squad for the three-test series which starts July 2.