The Peterborough United chairman and the Football League pundit are not impressed with the Wolverhampton Wanderers managerial change.
Jackett was dismissed from his managerial role at Wolves on Friday night, having been given the job back in May 2013.
Under the former Swansea City and Millwall boss, Wolves returned to the Championship from League One and did relatively well in the second tier of English football thereafter.
Wolves narrowly missed out on the Championship playoffs during the 2014-15 campaign, but they ended up outside the top 10 last season.
Former Italy international goalkeeper Walter Zenga has replaced Jackett as the Wolves manager.
Zenga is an experienced football manager, having been in charge of Red Star Belgrade, Palermo, Sampdoria and Al-Shaab among other clubs.
@DMAC102 it would be a mistake to keep him because he's British. Last season was awful. You should take him!— Rob Cross (@robcross82) July 30, 2016
He won promotion, finished high 1st season back in champ & hasn't been backed massively.. Harsh imo. https://t.co/hlluSfn36M— Darragh MacAnthony (@DMAC102) July 30, 2016
I don't think that new manager of Wolves Walter Zenger is the right fit for the Championship. Thought K.Jackett deserved one more season— Adam Virgo (@Adamvirgs19) July 30, 2016
Wolves will kick off their 2016-17 Championship campaign with an away game against Rotherham United next weekend.