McClaren heaped praise on the way his team had performed this season.
He told the club’s official website: “Today we made history. It’s more than a miracle.
“What a fantastic bunch of players,” he added in an interview with Dutch broadcaster NOS.
“I said at the beginning of the season I don’t know if we have a team, I couldn’t tell. They grew and grew, they deserve it. They deserve it.”
He added: “It’s a fantastic achievement by the players, the staff, the medical team. Everybody deserves it, especially (chairman) Joop (Munsterman). It’s fantastic, also for the supporters, what an achievement.”