Gladbach finished fourth in the Bundesliga last term and should they make it through the two-legged fixture (21/22 and 28/29 August), they would join fellow Bundesliga rivals Borussia Dortmund, FC Bayern Munich and FC Schalke 04 in the group stage of the tournament proper.
Gladbach "well prepared"
"I absolutely agree with the fans - we would have preferred Panathinaikos or Copenhagen as an opponent," said Foals' club president Rolf Königs afterwards. "But we'll deal with it. They were the most difficult opponent in the pot. I hope we can get a good result, we're well prepared."
Vice-president Rainer Bonhof agreed: "I'm in shock, but we'll accept the challenge head on. It would be great if we could finish the job and qualify for the group stage."