"The second half display's as good as we've seen all season," the 39-year-old told the club's official website.
"I don't want to underestimate what we've come up against here - this is a very, very good team. I think their position in the table's false.
"We've more than matched one of the better teams in the league. It was a brave performance second half and we have to show that bravery for longer periods."
Barnsley are 22nd in the Championship, although they are level on 10 points with Bolton Wanderers.