Valerien Ismael has once again been left frustrated with a referee after Leigh Doughty did not give Barnsley a first half penalty in a 0-0 draw at Nottingham Forest on Saturday.

Centre-back Michal Helik was clearly pulled down by Samba Sow in the 22nd minute, following on from Wednesday's 2-2 draw with Cardiff City in which referee Andy Woolmer gave the visitors a controversial corner which they scored from.

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Ismael called the performance of Doughty 'unacceptable at this level' and told the Chronicle: "I can't understand it. We have had two really really big game-changing mistakes in two games. It's enough, we need to have clear and proper decisions. It is a big big frustration that we only got a point.

"Those decisions can maybe only happen once in the whole league but they happen to us twice in two games.

"We are not stupid - we can all see the foul. Only one guy cannot see it. It was a really really poor performance. If I can see it from my angle, he can see it. He was in exactly the right place.

"It would have been a completely different game if he gave the penalty. Two games in a row we have had incredible poor decisions.

"We have to keep going and the feeling is good from the performance if everybody does their job, we could have six points in the last two games."

Helik added: "I think we showed a decent performance. I am glad that finally we keep the clean sheet.

"We should have a penalty on me so that is unlucky. I tried to shoot and I would shoot better if the defender didn't pull my hand and twist me. It should be a penalty but in the end it is 0-0.

"It is frustrating but it is part of the game and we can't change it. We have to keep playing well and maybe wait for better refereeing decisions."

Ismael was happy with a first league clean sheet in 14 games. He said: "There were lots of positives when you think that Nottingham had a week to prepare and we had only two days. It was a good point away and a clean sheet after a long time.

"We lost control in the middle in the first half, Nottingham had chances through our sloppy clearances. We changed that in the second half and we tried to find a way to score. We missed a chance with Cauley Woodrow but in the end the big frustration is the penalty decision."

Ismael confirmed that midfielder Romal Palmer has a hamstring injury and will miss eight to ten days.

Barnsley have a free week before hosting Derby County on Saturday, the first of seven games in 20 days. Ismael said: "We need to get the guys fresh again then we can work in training for the Derby game. After that, there is another big block of games in February."