Alastair Cook was one of England's most long-serving Test cricket captains
Alastair Cook resigned earlier this month after nearly five years in charge with a 4-0 Test series defeat in India pushing him to give up the job.
Joe Root was named as his successor but Flintoff, who led England for 11 Tests and won just two, wanted Cook to go on for another 12 months.
“I was a bit disappointed that Alastair finished,” Flintoff told Express Sport.
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“He played under me and I’ve seen his career go through.
“I didn’t like the criticism he was getting towards the end from media, ex-captains, ex-players and the public.
“I didn’t think he deserved that.
Freddie Flintoff captain the side on a disastrous tour of Australia in 2006/07
“But unfortunately when you finish a job like England captain, you very rarely get to finish it on good terms.
“I would like to have seen him do one more Ashes but it was his decision and you have to respect that.”
Root now has seven Test matches – four against South Africa and three against the West Indies – to find his feet in the job before heading to Australia.
England are looking to avenge Cook’s last tour there when they were blown away by Mitchell Johnson and co in a 5-0 whitewash.
And while he won’t be leading the side, Flintoff wants the former skipper to play an important role at the top of the order.
“Hopefully now [Alastair] will carry on his career and score thousands and thousands more runs,” Flintoff added.
“I don’t know Joe Root that well but he did seem like the obvious choice.
“There was nobody else you could really look at.
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“I think he’ll do great.
“He’s a fine player and the way in which he plays his cricket means he’s a joy to watch so hopefully he’ll be successful.”
***Freddie Flintoff has teamed up with Fitbit to get the nation dancing for Red Nose Day. With a mission to raise £150k for Comic Relief, Fitbit will donating £15 for every dance video uploaded using #StepUpGetDown. Visit www.fitbit.com/rednoseday for more details.***