The Hoops will appeal the red card picked up by Scott Brown during Sunday's Old Firm derby, which Rangers won thanks to a late Maurice Edu goal.

But Smith claims the Scottish champions were also denied a penalty during the clash at Ibrox, when Edu appeared to be fouled in the box by Andreas Hinkel.

Despite those decisions, the Rangers boss praised the overall performance of referee Dougie McDonald after the game.

He also used his post-match press conference to hit out at the unnamed Celtic source who revealed the club's unhappiness with refereeing decisions this season just days before the crucial match.

"Because of what happened prior to the game I think it was always going to be the case that people would focus on decisions in Sunday's match," said Smith.

"Everything is highlighted in the Old Firm game from the referee's performance to each player's performance and you just have to accept that.

"Decisions go against us at times, despite what everyone else seems to be saying.

"We should have had a penalty, for example, when Maurice Edu was taken down in the box.

"However, the main thing from our point of view was our performance in the second half."

The dramatic late winner allowed Rangers to restore their 10-point lead at the summit of the Clydesdale Bank Premier League and put a massive dent in Celtic's own title hopes.

But Smith was unhappy at the lack of credit given to his players.

He told RangersTV: "I think we showed we can play well and I'm disappointed that this never gets mentioned.

"All we ever hear is that Rangers dig out a result and do this and that but in that second half we played very well, passed the ball well and created a number of chances.

"We kept a team that have tremendous attacking players back in their own half albeit we had the benefit when Celtic went down to 10 men halfway through that period."