"I felt we deserved an awful lot more than what we got. Our first-half performance was excellent," he said after the 1-1 result.
"But I can ask no more of the players - their effort and performance was very good. One or two moments of lack of concentration have cost us. I am very disappointed to lose two points near the end.
"We put so much into it, but Millwall have a very strong squad. We knew it was going to be difficult when they can produce firepower like that."