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Motherwell defender Stevie Hammell admits he knew nothing of Tony Watt before the teenage Celtic striker came off the bench to score a dream debut double in the Hoops' 3-0 win at Fir Park on Sunday.

The Clydesdale Bank Premier League champions showed six changes in personnel and went with an unfamiliar back three for the trip to Lanarkshire and there were a few puzzled looks in the press box when the 18-year-old replaced Pawel Brozek just before the hour mark.

However, two goals in three minutes, the first when he volleyed in a Victor Wanyama cross from a tight angle and the second when he drove low past Well keeper Darren Randolph from the edge of the box, made the former Airdrie striker an instant hero to the travelling supporters.

Hoops wing-back Cha Du-ri headed in a third near the end to leave Motherwell three points ahead of fourth-placed Dundee United as the race for a Champions League qualifying spot heats up.

However, while the Celtic fans left the stadium talking about their young substitute, for Hammell it was a case of Tony who? rather than Tony Watt.

"To be honest I hadn't heard of him before the game," said the Well left-back.

"There was a bit of the unknown about him but he took his two goals really well.

"They have that many players to choose from, we didn't know what their team was going to be and their shape and set-up surprised us a bit.

"But from our point of view it was a disappointing day."

Celtic assistant manager Johan Mjallby took over media duties once again from Neil Lennon, who was serving the first of a two-match ban for criticising referee Willie Collum after last month's Scottish Communities League Cup final defeat by Kilmarnock at Hampden.

Mjallby confirmed Watt "is definitely going to be in our thoughts" for the Old Firm game at Parkhead next week.

The former Hoops defender joked the star of Celtic under-19 side could be the target for some of the senior players at training this week, while Joe Ledley, who set up Watt for this second goal, claimed the youngster now "owed him one."

The Wales midfielder, though, was more serious when revealing that the players were keen to make up for last week's William Hill Scottish Cup semi-final defeat against Hearts at Hampden.

Ledley is now looking to pay back Rangers for their 3-2 win over Celtic at Ibrox last month.

"We were disappointed with the result last week and just wanted to bounce back," said Ledley.

"We also needed the win for the game against Rangers.

"Our aim is to get as many points as we can and we owe ourselves after the last performance against Rangers.

"I know we had two sent off but we know we can play better than that and hopefully we do this time round."