BBC Scotland examines the impact of Bologna's Lewis Ferguson in the Scotland midfield going into the crunch game with Brazil.

A much-fancied 18-year-old, the young talent had surged to prominence for the small Lanarkshire team, marshaling a midfield with Darian MacKinnon and Ross Jenkins. On Wednesday, he could be his country's key man in stopping Matheus Cunha, Vinicius Jr and Casemiro to make history for Scotland. Two games into their Group C campaign, Ferguson has probably been Steve Clarke's most influential player. But how has Ferguson emerged from the shadow of Tartan Army heroes Scott McTominay and John McGinn to be such an important cog in the machine? A successful spell at Aberdeen helped propel him to Serie A where he became Bologna captain. He now has four seasons in Italy and a Coppa Italia under his belt, so by no means is he a left-field pick. Having said that, he has found international appearances hard to come by given the plethora of talent in the squad. However, misfortune can lead to opportunity. Billy Gilmour's knee injury in the friendly against Curacao last month left a gaping hole in Steve Clarke's line-up as a holding player behind McTominay. Against Morocco, he managed to break through an African line 15 times, the most of any Scotland player going forward.