Kenny McLean backed the controverial star to the hilt.The Sheffield United striker has come under fire for pulling out of Steve Clarke’s squad for the upcoming Nations League openers, only to play for the Blades in a friendly against Derby two days later.But McBurnie took to social media in an attempt to explain the background to his appearance.He said: “Nobody is more frustrated than me at having to withdraw from the Scotland squad for this double-header.