February 2015 after being unable to recover from a long term hip injury. International career Caldwell made his full international debut for Scotland in the first match managed by Berti Vogts, a 5–0 defeat to France at the Stade de France. He scored the only goal of the game as Scotland defeated France 1–0 at Hampden Park, on 7 October 2006 in a Euro 2008 qualifying match. He was sent off, however, in a key 2010 FIFA World Cup qualifying match against Norway. He played alongside his brother Steven in five matches; they were the first siblings to play together for the national team since the 1940s. Coaching and managerial career Wigan Athletic After retiring as a player in February 2015, Caldwell formally joined the coaching staff at the Wigan Athletic academy. He was appointed the new manager of Wigan Athletic on 7 April 2015 after the dismissal of Malky Mackay with the club 23rd in the Championship with five games remaining. Caldwell was unable to halt the club's relegation to League One but was assured by club chairman David Sharpe that he would remain in charge. The following season Caldwell guided Wigan to the League One title and promotion back to the Championship at the first attempt. Along with club success Caldwell was also recognised with the manager of the month award for February and the LMA League One Manager of the Year award. On 25 October 2016, after 18 months in charge, Caldwell was dismissed by Wigan, with the club in 23rd position and winless in four games. Chesterfield In 2017, he was appointed manager of League One club Chesterfield on a one-year rolling contract, following the dismissal of Danny Wilson. He was unable to prevent the club being relegated, and was sacked on 16 September after a bad start to the 2017–18 EFL League Two season. Partick Thistle Caldwell was appointed manager of Scottish Championship club Partick Thistle in October 2018. Thistle avoided relegation at the end of the 2018–19 season, but Caldwell was sacked in September 2019 as the club sat second-bottom of the 2019–20 Scottish Championship table. In 2021 Caldwell was named interim manager of Newcastle United's U23s team. Later that year he joined Manchester City in a role overseeing their players loaned to other clubs. Caldwell re-joined Hibernian as their assistant manager in December 2021, working alongside Shaun Maloney. They were sacked in April