We continue our countdown of the greatest 30 footballers to have played for the Bhoys.
Number 22 on our countdown of the greatest 30 players to have turned out for Scottish giants Celtic goes to a man who achieved the rare distinction of becoming a Bhoys legend despite growing up as a Rangers fan.
Signed in 1967 after being turned down by the Gers, Danny McGrain emerged as one of the club's leading lights in the post-Lisbon Lions era of the early 1970s.
A contemporary of players such as Kenny Dalglish, McGrain recovered from a fractured skull suffered in 1972 to become the club's first-choice right-back under Jock Stein, a position he would dominate until leaving the club in 1987.
An iron tackler, but also boasting the pace and ability to bomb up and down the flank, the Glasgow-born star forged a reputation as one of the greatest full-backs in the world.
He played in two World Cups for Scotland, missing the 1978 tournament through injury, and won 14 major trophies including seven league titles in his time at Parkhead.
Named the Scottish Football Writers' Player of the Year in 1977, an impressive feat for a defender, and was named club captain at the start of the following season upon the departure of Dalglish.
One of the most impressive things about McGrain was the way in which, upon returning from an injury lay-off of almost 18 months in 1979, he made up for his lost pace and mobility by transforming from a scampering full-back into a ball-playing visionary in defence.
McGrain played regularly for Celtic until the age of 36, when he was given a free transfer to Hamilton Academical after playing over 650 games for the club, still the fifth-highest total in the club's history, and perhaps the only real disappointment is that he did not end his career as a one-club man.