Flintoff has targeted the tour to Bangladesh in February 2010 to return
Former England Test all-rounder Andrew Flintoff has undergone surgery on his injured knee.
The 31-year-old, who bowed out of Test cricket after England's Ashes win on Sunday, went under the knife on Monday.
He underwent a routine arthroscopy and micro-fracture to two small areas in his right knee and will be non weight-bearing for six to eight weeks.
It is not yet known how long Flintoff, who will continue playing one-day cricket for England, will be out for.
"At the end of the six to eight week period, the knee will be reviewed by his surgeon and the timescale for ongoing rehabilitation further determined," said an England and Wales Cricket Board statement.
Flintoff signed off his Test career by helping England reclaim the Ashes from Australia, courtesy of a 197-run victory at The Oval which clinched the series 2-1.
The 31-year-old is still committed to representing his country in one-day and Twenty20 internationals and is hopeful that exploratory surgery will enable him to do so in the future.
The tour of Bangladesh, which begins in February 2010, is a potential target for Flintoff's return to England action.
Meanwhile batsmen Alastair Cook and Ian Bell will feature in County Championship action on Wednesday.
Durham bowlers Steve Harmison and Graham Onions are in action from Friday and Northamptonshire spinner Monty Panesar from 31 August.