He only realised the full extent of the ankle injury at the end of the season, and he had an operation to correct it. He was out for three months, including the first month or so of Newcastle's season. Simpson returned to action from his injury lay off, playing two reserve games in October. He made his first start of the new season in Newcastle's 2–1 victory over West Ham United, replacing James Perch at right back. Simpson kept his right-back spot with consistently strong performances, forming a strong partnership with Joey Barton on the right flank. On 20 September 2011, Simpson scored a curler in Newcastle's 4–3 win over Championship side Nottingham Forest in the third round of the League Cup. On 10 December 2011, Simpson started alongside James Perch at center back in place of the injured Steven Taylor and Fabricio Coloccini for Newcastle's 4–2 defeat at Norwich City. He had played at right back for the beginning of the season. On 4 January 2012, Simpson started for Newcastle during their 3–0 win against Manchester United, and produced a fantastic saving clearance off the line against his old club on his 25th birthday. Queens Park Rangers After his contract with Newcastle expired at the end of the 2012–13 season, Simpson signed a three-year deal with Championship club Queens Park Rangers on 27 June 2013. He scored his first goal for QPR in a League Cup tie against Exeter City on 6 August 2013. He made 36 Championship appearances for QPR as they earned promotion via the play-offs. Leicester City On 30 August 2014 signed a three-year contract for fellow promoted team Leicester City for an undisclosed fee. Simpson made his Leicester debut in a 2–0 defeat against Crystal Palace off the bench on 27 September 2014. However, he didn't make his second appearance for the club until 7 December against Aston Villa, as he often struggled to get into the side ahead of regular right back Ritchie De Laet. Simpson made 14 appearances overall for Leicester in the 2014–15 season. In the 2015–16 season, under the new management of Claudio Ranieri, De Laet was again preferred ahead of Simpson to begin with. However, following a 5–2 defeat by Arsenal, Ranieri changed his full backs bringing Simpson in for De Laet helping to shore up Leicester's defence, as Simpson was considered a much more defensive full-back than De Laet