Former Rangers player Nacho Novo has launched a scathing attack on Celtic and said that "whatever happens, Rangers will always be the best team in Scotland".
The forward - who recently rejoined his first club, Spanish Second Division outfit Huesca - played at Ibrox between 2004 and 2010.
He hit out at Celtic fans, saying they had sent him death threats, and described the Parkhead side as "a sham of a club".
Novo said: "Since the invention of Twitter, the threats have multiplied. A lot of Celtic supporters every day wish for my death and that of my children.
"It is really unpleasant - although it's normal practice in Celtic, a sham of a club, calling itself Catholic but not at all. You only need to look at its recent history and see the shady events that club has had. It thinks it is fooling people.
"That's why it's an honour to be from Rangers, a team with values, with respect and with history. Whatever happens, it will always be the best team in Scotland."
But Tom Boyd, a treble-winning Celtic captain, said Rangers were solely to blame for the problems currently facing the Scottish game.
"If it [the Scottish game] has been damaged, it has been damaged by one club and what has gone on with them, and it is the consequence of that," Boyd added.
"It is something that has happened and we need to get on with it - Rangers are no longer in the SPL and the teams will need to adjust accordingly and then move on."
Boyd, who won the treble with Celtic in 2001, urged supporters of SPL clubs to "get behind their own teams and help promote Scottish football". He added: "It has been doom and gloom up until now, and we have got to try and change the outlook of it."