Allardyce was pleased with his goal, and is sure it will continue to boost his confidence.
"You've got to be there to finish them off haven't you?" he told Rovers Player.
"Put him in front of goal and was cool and calm. It was a little more difficult this one than the one he scored against Everton.
"That was a well-taken goal but this one was a lot further out, he had to make sure he got it past the last defender and just stroked it in.
"Under that pressure now everybody expects you to score, but you've got to hold your nerve and make sure you do, and Niko did.
"So that will boost his confidence very well."