De Boer's side beat Neil Lennon's Hoops 1-0 in Amsterdam on Wednesday night, forcing them to the bottom of Group H, but the Scottish champions remain in a position to go through as they sit just a couple of points in arrears of second place.
"There was more pressure on us after the game in Scotland so we are relieved.
"It is still wide open and we have still to go to the San Siro.
"We also have to play against Barcelona and a point will be a bonus point.
"They are already qualified and we have nothing to lose."
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