The Dutchman celebrated his 40th birthday earlier this year yet, apart from one mistake against West Brom in October, has still been performing to his usual high standards.
But Ferguson feels this campaign will be his last.
"We are planning for this being his last season," he said.
Given his vast experience, Van der Sar is bound to be an attractive proposition as a coach, although Ferguson admitted talks are still to take place on the matter.
"We have not discussed it," he said.
"But Edwin is a player who would be of interest in terms of his knowledge and standing in the game."