Rangers must "believe" they can still be crowned Scottish Premiership champions despite their faltering form. 

That's the opinion of former Ibrox captain, Barry Ferguson, as he addressed comments from ex-Rangers teammate, Kris Boyd, who took aim at manager Philippe Clement and declared Celtic as winners following the 0-0 draw against Dundee on Wednesday.

Sky Sports pundit Boyd disagreed with Clement's evaluation of the Rangers' performance at Dens Park, where they were booed off by a disgruntled away end.

The stalemate resulted in Celtic holding a three-point lead at the league summit, aided by their superior goal difference - with five games to go. 

But Ferguson isn't writing off Rangers just yet after experiencing numerous title run-in's during his 18-year playing career.

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"I have been in football long enough to realise anything can happen. It is still possible for Rangers," he told the Go Radio Football Show.

"And from a Rangers point of view they have got to believe that. They are going to have to do it the hardest way possible and if you look back on the last couple of games I can see why people are saying it's not going to happen for Rangers, but listen, I know how football operates.

"I have been involved in a couple of these run-in's in the past and while you are still involved you have got to believe."