MARTIN O'NEILL insists Rangers have to beat Celtic on Sunday to still have any chance of winning the Scottish Premiership title.

Giovanni van Bronckhorst's side are three points shy of the top of the table and their rivals have the chance to extend that tally at Ibrox on Sunday.

The derby showdown will have a huge say in the title race and ex-Celtic boss O'Neill has piled the pressure on Rangers ahead of the clash.

He told Superscoreboard: “The pressure is definitely on Rangers.

"They are unlikely to claw back that goal difference in the number of matches left, so it looks like a four point difference. So really, Rangers have got to win this game.

"If Celtic come out of this match unscathed then you'd have to say they really are in pole position. If Celtic go and win the game, which I'm sure is in Postecoglou's mind, you'd have to think their position is very strong indeed.

"Rangers have all these things to contend with, playing every Sunday then Thursday. Obviously with these matches there's more chance of you picking up injuries.

"You'd have to say that is a massive advantage to Celtic in terms of concerns about injuries."

O'Neill also was quick to praise Celtic boss Ange Postecoglou for an impressive first season in charge of the Hoops.

He added: "I think he has done wonderfully well.

"He came in and had a difficult time, a tough beginning. When you are under pressure early on, particularly at a club like Celtic, you might have to change your principles.

"He has stuck to his task and there is a good old style about it as well. I have the utmost regard for him.

"When I went up myself at the turn of the century we had to turn around a 21 point deficit.

"We beat Rangers after about five games, 6-2, in a big match. The more I think about it, maybe it was a watershed moment because we got confidence from winning that game.

"When we won the treble it was terrific. It was great to know it was the first time since the immortal Jock Stein had done it. For Postecoglou to be contemplating that in his first year is a terrific effort."