James Harrison says it's the NFL's fault Nick Chubb is done for the season -- not Minkah Fitzpatrick's -- telling TMZ Sports he believes the league's rules forced the Steelers safety to go low on Monday night.
The former Pittsburgh superstar didn't mince words when talking about the hit that ended Chubb's season ... explaining he thinks Fitzpatrick had no other choice than to aim for the Browns tailback's knees on the controversial play.
"You've made it to where if a guy goes in there and comes in high and hits him in the head, now he's getting fined," Harrison said.