Millen unhappy with referee Miller
Referee Nigel Miller awarded the home side a penalty 32 minutes into the game after Marvin Elliott was adjudged to have handled the ball in the box.
Andy Gray had no problems in converting the spot kick and Barnsley went on to take a 3-1 half time lead.
There was no doubt that the decision changed the game and City manager Millen didn`t see it as the right decision.
He told the Press Association: 'It's hit Marvin on the side of the hip and that's what annoyed the players.
'The referee saw it as a penalty because he was facing it but the linesman didn't see it as a penalty.
'I can understand the referee making the decision but with the linesman, they are supposed to communicate when they are miked up.
'You would think between the two of them they would get the decision right.
'Up to the decision I was delighted with the performance, we should have scored more goals in that period.
'We looked really dangerous and then the penalty decision - the manner of it upset our lads - and we lost our focus and Barnsley punished us. To come in at 3-1 down at half-time was unbelievable.'
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