England will have to re-visit Zimbabwe as part of their commitment to the ICC's future tours programme.
Vaughan's men are set for another soul-searching time
England and Wales Cricket Board chairman David Morgan confirmed to The Guardian the team would have to return to play two Test matches.
Their current tour includes only five one-day internationals, but in the New Year Zimbabwe return to the Test fold.
They have been suspended for much of 2004, with Tests against Australia, Sri Lanka and England deferred.
Zimbabwe's Test status was suspended by the ICC in June after 15 rebels dropped out of the squad after the then captain Heath Streak was sacked.
The ICC subsequently ruled that Zimbabwe would return to the Test fold from the start of 2005 but no dates have yet been arranged for any of the postponed Tests.
Morgan said: "We will have to return to play two Tests at some stage.
"We will be in discussions with Zimbabwe Cricket about when [a second tour] will happen during the course of this tour."
Explaining why he felt the need to accompany Michael Vaughan's team in Zimbabwe, Morgan added: "Having pushed for this tour to go ahead I could not in good conscience have not been with the team through this tour."
For now, the team are in Namibia, preparing for two warm-up matches in Windhoek.
So far unseasonal rain has prevented them from having any net practice, limiting the players to workouts in a gym.
But Namibian cricket officials are hopeful the recent downpours will cease in time for Sunday's encounter at the Wanderers ground, which is expected to attract a crowd of around 4,000.