Muirhouse and Arsenal star Kieran Tierney is critical to the way Scotland head coach Steve Clarke operates his side, according to former national team striker Kris Boyd.The defender has recovered from an ankle injury in time to start tonight's match with Moldova in World Cup 2022 qualifying Group F.Victory would secure a play-off spot at the major tournament in Qatar next year and the former Celtic star's importance to the nation's goals has been highlighted.Tierney of Muirhouse plays centre-back for Clarke, despite being a left-back at club level, and he starts alongside Liam Cooper and Jack Hendry for the first time tonight.Boyd believes Tierney's connection to left-back Andy Robertson is why the Arsenal star is a guaranteed pick for
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