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Toffees boss Roberto Martinez made a spying mission to Scotland on Sunday to watch the attacking 19-year-old left-back against Hibs.

Everton had been poised to table a £750,000 offer for the promising youngster, capped three times by Scotland at under-21 level, and then loan him back for the rest of this season.

But the Tannadice club have indicated Everton must offer a total package closer to double that figure if they want to sign him.

Robertson, who joined the Premiership outfit from Queen's Park in June last year, recently signed a new contract with the Tangerines which ties him until 2016.

He has become a mainstay of Jackie McNamara's side having made 25 appearances this season, scoring five goals.

Martinez, meanwhile, could have Leighton Baines available for the Toffees' Premier League clash with Norwich his weekend, after he missed their FA Cup win over QPR.

"Leighton just had a back spasm and is recovering as we expected," Martinez said.

"I don't think he's going to be too far away and I would say he'll be back in training on Thursday.

"We'll then have to assess him. Back spasms can be cleared completely or they can leave you a little bit with a lack of mobility.

"Any player needs to be 100 per cent to be able to play and to be considered."

Martinez confirmed captain Phil Jagielka and fellow centre-back Sylvain Distin could be out for another fortnight.

Everton have extended Luke Garbutt's loan with Colchester by a month.