Teenager Tony Watt made a sensational debut for Scottish Premier League champions Celtic as he scored twice in his side’s 3-0 defeat of Motherwell at Fir Park yesterday.

The 18-year-old, signed from Airdrie last year, replaced Pawel Brozek in the 59th minute and scored his first just over three minutes later when he volleyed in Victor Wanyama’s cross.

Watt grabbed his second in the 66th minute, sending a low drive into the bottom corner to mark a memorable start to his Celtic career.

South Korean international Cha Du-Ri rounded off the win when he headed in substitute Paddy McCourt’s cross in the 83rd minute.

The win keeps the Hoops 18 points clear of second-placed Rangers ahead of next Sunday’s Old Firm derby at Celtic Park.

Celtic assistant manager Johan Mjallby was very satisfied with his team’s showing.

“I thought it was a very good performance. Although it was goalless in the first half, I felt we created chances,” Mjallby said.

“We got the first one and then we grew from that. It was a sensational debut for Tony.”

Motherwell coach Stuart McCall felt his side had competed well with the champions.

“At half-time we were still well in the game. It was an open game and they had chances and we had chances. It was a disappointing result and not what we were looking for but we’ve got four huge games still to go,” he said.

Watt replaced the ineffectual, on-loan Polish striker Brozek and he scored with almost his first touch.

Wanyama sent in a measured cross from the right and the teenager met it at the far post to send an angled volley under the legs of keeper Darren Randolph.

Watt got his second after Joe Ledley picked him out in the box with a pass and he took a touch before drilling an angled shot through the legs of Shaun Hutchinson and past Randolph again.

Cha made sure of the three points when McCourt swung the ball into the box and the South Korean bulleted a header past the keeper from close range.

Other result: Hibernian vs Kilmarnock 0-1.