left fans taken aback when he made a surprise appearance at Park ahead of his beloved team's Champions League clash against .

The rocker, who has been a lifelong fan of the Scottish champions, confessed he'd "had a couple" of drinks when CBS Sports presenter Peter Schmeichel interviewed him.

The hilarious interview began with Rod, 80, jokingly telling the 60,000 fans in the stadium to "shut up" as they began to sing while he was talking.

He then discussed his love of Celtic before abruptly switching his train of thought to bizarrely ask the legendary goalkeeper: "How are you doing?" and adding: "I've had a couple."

This prompted an eruption of laughter among the pundits, including Rod's longtime pal .

Schmeichel tried to get the chat back on track by asking the Sailing singer for his game predictions. Rod prompted more laughter when he replied: "It's not going to be easy but you've got to remember that we have beaten Barcelona, AC Milan, Manchester United.

"So, if we get lucky and don't make any c*** ups in the first couple of minutes, we're in with a good chance... Did I say c*** ups?" he chuckled.

Jamie then asked: "If Celtic win tonight, is it going to be a big night?" Rod joked: "Yeah, it could be a big night...whatever happens, I'm so proud of this club, and I'm proud to be interviewed by Gordon Banks!"

The host and pundits erupted once again, and Rod laughed: "You had better get me off the air. I'm embarrassing myself!"

The interview ended with Rod singing an impromptu duet of Maggie May with Liverpool legend Jamie.

The surprise appearance exploded on social media and was quickly trending on X/Twitter.

One fan tweeted: "Drunk Rod Stewart on the CBS broadcast this is the best sports coverage on earth."

Another said: "A drunk Rod Stewart talking to the CBS crew about Celtic-Bayern. Inject this interview into my veins. So good."

A third commented: "File this Rod Stewart interview under ICONIC."

And a fourth wrote: "Rod Stewart on CBS's Champions League show is grade A content."