Glamorgan have confirmed South African batsman Alviro Petersen will not return for 2012.
Petersen has made a successful return to Test cricket and he has committed himself to the Proteas' 2013 tour to England.
Petersen, 30, led Glamorgan in 2011 and speculation had suggested he could re-sign as a Kolpak player.
In a Glamorgan statement on Wednesday the club said that Petersen would now not return in April.
"A signed agreement was reached with Alviro, and the club would have sought ECB clearance on his Kolpak status immediately upon his announcement to retire from international cricket," the statement said.
"However, following his successful recall to the South African Test team, Alviro informed the club earlier this week that he had had a change of heart and has asked the club to release him from his commitment.
"Whilst the club was keen to retain his services, it understands the importance and honour of playing international cricket and has therefore reluctantly agreed to his request to be released from his Glamorgan commitments.
"The club will now carefully consider its options as it looks to finalise the make-up of its squad ahead of the 2012 season."
Petersen had marked his return to the South Africa side with 109 against Sri Lanka in the Test at Cape Town.
That leaves the Welsh county pondering whether or not to recruit another overseas batsman with next summer's Twenty20 competition in mind.
The county already have Australian batsman Marcus North signed on a two-year contract as their overseas player.
Petersen, who could be back at the Swalec Stadium on Frida, 24 August, when South Africa play a One Day International against England, scored more than 2,000 runs in all forms of cricket during 2011, including more than 1,000 runs in County Championship Division Two.
He was named the players' player of the year and the Championship player of the year at the county's end of season awards.
Most of the Glamorgan squad, apart from those playing overseas, have returned to pre-season fitness training while Australian coach Matthew Mott has returned to being their preparations.