John Hartson insists it will be party time should Celtic beat Rangers on Saturday.
The Welshman feels that three points for Ange Postecoglou's side in the derby would signal an end to the title race.
And if that turns out to be the case, the former Hoops striker is expecting some wild celebrations in the east end of Glasgow.
The 48-year-old has warned for some caution at the same time though, admitting that Rangers have the potential to "upset the apple cart".
However, the ex-frontman can't see past a victory for his old side on their own patch in the latest installment of the derby fixture.
Hartson told The Go Radio Football Show: "Although Celtic are nine points clear if they win they are making a slight fist of it, and they have to win.
"They have to put in a winning performance against a team that have lost one game all season and are in incredible form. I believe if Celtic wins it, and I have refused to say this all season, it's party day.
"There is no way back. They will go nine clear, plus the goals (difference). But if Rangers win it they could upset the apple cart slightly.
"They will feel they have got a little bit of hope. They have to go and perform at Celtic Park with no fans behind them and against a team who are on fire."
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