Papali'i will quit the Tigers at the end of the 2024 campaign, cutting short his three-year deal after just two seasons to join Penrith from the start of next year.
The New Zealand international arrived at Concord off a standout year in 2022 with Parramatta where he powered the Eels to the grand final and was named Dally M second-rower of the year.
But since his arrival at the Tigers, on a contract reportedly worth $750,000 per season, Papali'i is the first to admit that he has flattered to deceive.
It's why Tigers chief executive Shane Richardson told him he was free to leave, opening up salary cap room for coach Benji Marshall to play with.
Isaiah Papali'i has been out since suffering an ankle injury in round 12 against the Cowboys. (Scott Radford-Chisholm/AAP PHOTOS)
Asked if he felt he had reached the bar he set during his barnstorming two seasons at the Eels, Papali'i said: "To be honest, probably not, I think I've struggled to find form.
"That led to me asking for a definitive answer on whether my future was here.
"I think the club as a whole was trying to find their feet, you can tell that by the results and I think that's what 'Richo' is doing.
"He is making some bold moves and that's a credit to him because he's doing it in the right way.
"For me it's just been a struggle, (having) a few different halves and I guess the club is trying to build a foundation here.
"I wanted to make sure my job was secure post 2025 and there wasn't an answer for that.
"I don't think it was whether I wanted to stay or go, I wanted to know I was part of the picture but we both agreed my form wasn't the best."
Papali'i's comments came amid reports out of England that John Bateman would be loaned to Super League side Warrington for the rest of this campaign.
Bateman, like Papali'i, has struggled to hit the high notes in his NRL second coming but is expected to return to Concord next season.
The permanent exit of Papali'i, who will return from an ankle injury in Friday night's round 21 opener against the Warriors, has given the Tigers the spending power to retain Stefano Utoikamanu.
Stefano Utoikamanu takes the ball up and is tackled by two Roosters defenders. (Mark Evans/AAP PHOTOS)
Prop Utoikamanu has been on a media ban as uncertainty grows over his commitment to the club.
Utoikamanu is expected to make a decision on his long-term future this week as he weighs up offers from Melbourne, with captain Api Koroisau urging the front-rower to recommit to the Tigers.
"I want him to stay, he's obviously very proud of this team," Koroisau said.
"At the end of the day we need great players and Stef is one of those and he's a great leader."
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