The Peterborough striker was yesterday drafted into the squad ahead of Sunday's friendly against Brazil at the Emirates.

Watford-born Mackail-Smith is eligible for the Scots thanks to his Scottish grandmother and has impressed Levein with his 27 goals for the Posh so far this season.

The Scotland boss said: "Craig is a player Michael [Oliver, scout] has watched for some time and he has been highly recommended to us by Darren Ferguson.

"He has had a fantastic season and I am confident he will be able to translate his domestic form into the international arena."

Uncapped Mackail-Smith is now determined to prove to the Tartan Army that he is good enough for Scotland.

He said: "I knew the Scotland scout had been watching me this past year and I am delighted it has come to fruition.

"I certainly never imagined that I would be playing against Brazil on Sunday, the plan was to kick back on the sofa and watch it on TV.

"I have had a really good season and this just caps it off for me.

"Hopefully I will get a chance to show the Scotland fans what I am capable of."

Meanwhile, Robert Snodgrass believes his own involvement with the national team is all down to a change in attitude after swapping Livingston for Leeds in 2008.

He told the Scottish Football Association website: "I am delighted to be part of the squad.

"I have worked hard on my game since leaving Scotland because I knew that the level of competition is a lot more intense.

"It is not just my career I have turned around down here but my life, too.

"That's why being part of the Scotland squad is such an honour for me.

"I see it as a reward for the work I have put in at Leeds to help them get back to where everyone feels they belong."

Speaking from Scotland's training camp in La Manga, the midfielder added: "I have matured and I needed to.

"As much as I loved my time at Livingston I felt I had to get away from Scotland and try something completely different."