Coldrick played for several teams, including a single game for Harlequins and represented Monmouthshire at county level, before being selected by Newport in 1909. Coldrick gained his first international cap in a game against England as part of the 1911 Five Nations Championship. Under the captaincy of Billy Trew at the Swansea's St Helens Ground, Wales won the game 15–11. Coldrick was re-selected for the next game against Scotland, but failed to appear in the inaugural match in Paris. Coldrick was back for the final game in a Championship decider between Wales and Ireland and when the Welsh team won the match Coldrick became a Grand Slam and Triple Crown winning international. Coldrick played three games in the 1912 tournament, with his final rugby union international game being a contest against the French team at Rodney Parade. Although Wales beat France, eight of the fifteen Welsh squad never played for Wales again, Coldrick was one of them, though it was his own decision rather than a selection choice. In 1912, Coldrick made himself ineligible for further selection to the Welsh union team when he switched to the professional game of rugby league, joining Wigan RLFC. Coldrick played two international games for the Welsh national league team, both against England, in 1913 and 1914. He also played for the Great Britain team. Coldrick was selected to tour with the England squad on the Ashes tour of Australia and was selected for all three tests, scoring a try in the second game. In 1919 Coldrick approached the Welsh Rugby Union to have his amateur status re-instated, though his application was refused. He left Wigan in 1925, and joined St. Helens. A shared benefit for; Percy Coldrick, Charlie Seeling and Frank Walford took place in April 1925. Percy Coldrick played in Wigan's 13-2 victory over Oldham in the Championship Final during the 1921–22 season at The Cliff, Broughton on Saturday 6 May 1922. Percy Coldrick played left-, i.e. number 11, and scored a try in Wigan's 21–5 victory over Rochdale Hornets in the 1912–13Lancashire County Cup Final during the 1912–13 season at Weaste, Salford, on Wednesday 11 December 1912. and played right- in the 20–2 victory over Leigh in the 1922–23LancashireCounty Cup Final during the 1922–23 season at The Willows, Salford, on Saturday 25 November 1922.
