It will mean a replay is required during the Premier League's winter recess.
Son said, “It's disappointing because we were the better team, we had more chances than the other team but it's a fact that we drew so we have to replay," he said.
“I think the lads did a really, really good job to get us ahead. Gio dribbled past almost three or four players and played it to Coco (Lamela), Coco passed to me, unbelievable, so my job was only to do the finishing, so I'm grateful to the lads who made the opportunity.
“It's quite sad that we drew but it's a fact that we have to play at home, another game and we'll see what's going to happen."