Gray's side missed a number of chances against Darlington

He said: "It was the best performances of the season from Kirk and Hubertz.

"Poul has had an Achilles problem but he declared himself fit and I was very pleased with him.

"Andy had a very good game. His work rate was good. He kept the ball well and turned bad balls into good balls with his willingness to chase."

Gray, whose side beat Darlo 2-1, will face Walsall in the second round.