Sheridan's troubles have left Wales prop Gethin Jenkins in pole position at loose-head, where he started all three Lions Tests in 2005.
Against Scotland, tight-head Adam Jones underlined why he might join his team-mate with a dynamic all-round performance.
Part of a Welsh scrummage that outmuscled their opponents, Jones also showed agility around the field, quick-thinking at the breakdown and off-loading skills in contact.
VERDICT: A good bet for the Lions squad, and now challenging for a Test spot
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