Taarabt moved to England from Lens in 2007, linking up with a Tottenham side then managed by Jol.
"I have known him now for a long time," the Dutchman said. "When I was at Hamburg, I wanted him but thought the money Daniel Levy asked for was too much.
"Then I went to Ajax and I thought it was too much for a player that never played.
"Then I was too late after that because he went to QPR, where he did ever so well.
"Remember the fact he was an over £10million player 12 months ago, so I think you have to take them when they are bad and hopefully he will show his potential here."