Club career Schalke 04 On 23 December 2011, it was confirmed that Obasi was going on loan to Schalke 04 until the end of the 2011–12 season. Prior to a match against his former club, Hoffenheim, Obasi said that the club would remain in his heart and that he considered it as his second home. Obasi made his Schalke 04 debut when he played for 75 minutes in a 3–1 win over Stuttgart on 21 January 2012.Two weeks later, on 4 February 2012, Obasi scored his first goal for the club, in a 1–1 draw against Mainz 05. As the season progressed, Obasi continued to remain in the first team despite being sidelined with injuries. At the end of the 2011–12 season, Obasi made ten appearances and scored once for the side whilst on loan. On 2 July 2012, Schalke 04 confirmed that Obasi signed a three-year professional contract with them until 30 June 2015.The transfer fee was reported as €4,000,000 to €5,000,000 by Schalke's sport and communications manager Horst Heldt. Obasi was assigned a number 19 shirt. However, at the start of the season, Obasi suffered a setback when he continued to recover from his injury. After returning to training, Obasi then made his first appearance since joining them on a permanent basis in a 2–2 draw against Fortuna Düsseldorf on 28 September 2012. However, Obasi continued to be plagued by injuries and was on the substitute bench for the most of the season. At the end of the 2012–13 season, Obasi had made only seven appearances for the club. In the 2013–14 season, Obasi continued to recover from injury at the start of the season. After returning to training around November, Obasi did not make a return to the first team until the following month, where he played 20 minutes, in a 0–0 draw against Nürnberg. Despite suffering from another injury, Obasi scored his first goal in two years in a 4–0 against his former club, Hoffenheim, on 8 March 2014. After the match, Obasi said scoring a goal motivated him after missing out a long time. At the end of the 2013–14 season, Obasi had made nineteen appearances and scored three times in all competitions. Ahead of the 2014–15 season, Obasi was then reassigned a number 20 shirt for his last season with Schalke 04. He remained in the first team at the start of the season and then scored his first goal of the season, in a European match, in a 4–3 win over Sporting Lisbon on 21 October 2014.There were hints of getting a new contract, but Obasi suffered a shinbone injury that kept him out for the rest of the season. At the end of the 2014–15 season, Obasi was released by the club after his contract expired and had made ten appearances and one goal in all competitions. AIK On 23 October 2015, Obasi was handed a trial by Premier League side Sunderland. However, the club decided against signing him following the trial, citing his fitness concerns. Afterwards, Obasi went on trial at Eintracht Frankfurt. The club eventually decided against signing Obasi over his fitness concerns. On 4 August 2016, Obasi signed a short-term contract with AIK Three days later, on 7 August 2016, Obasi made his AIK debut, where he started and played the whole game, in a 2–0 loss against Malmö. Two weeks later, on 21 August 2016, Obasi scored his first goal for the club, in a 2–0 win over Örebro. After making ten appearance and scoring six times, Obasi helped the club finished second place in the league and for his performance, Obasi was offered a new contract by the club when his contract expired at the end of the season. However, a month later, Obasi rejected a new contract from AIK in favour of a move to China. Shenzhen At the end of the season, Obasi moved abroad again when he signed for China League One Shenzhen on 4 February 2017, signing a one-year contract and joining manager Sven-Göran Eriksson. International career Norway naturalization persuasion Obasi was offered the chance to represent the Norway national football team during his club career in Norway and Obasi stated that: "I don't regret dumping Norway to play for Nigeria, back then at Lyn Oslo with John Obi Mikel, I was encouraged to naturalize to receive a Norwegian passport and become a Norwegian, the Football Association of Norway wanted me to play for the Norway national football team at that time and I must confess I gave it a thought for a long time, I had already played for Nigeria in one of their friendly matches which was one of the deciding factors in my final choice, I love Nigeria and I was well received by the senior players in Super Eagles, I had to walk up to them in Norway's Football Association of Norway and say no". Nigeria Obasi was part of the Nigeria national under-20 football team that finished runners-up at the 2005 FIFA World Youth Championship. After the end of the FIFA World Youth Championship, Obasi was called up by the senior national team for the first time on 17 August 2005, in a 1–0 defeat against Libya. In July 2008, Obasi was called up by Nigeria national under-23 football team. However, the club refused to let Obasi go to the Olympics, leading him to take the situation to FIFA. Eventually, Obasi was given permission by the club's management to compete with the national olympic team and helped the side finish runners-up at the 2008 Beijing Summer Olympics. During the tournament, Obasi scored twice on 19 August 2008, in a 4–1 win over Belgium. In January 2010, Obasi was called up by the Nigeria for the Africa Cup of Nations. In the group stage, Obasi scored the opener in the 12th minute, but lost 3–1 against Egypt. Later in the tournament, Obasi helped the national team finished in third-place at the 2010 Africa Cup of Nations after beating Algeria. Six months later, Obasi was included in the 23–man squad for the national team in the 2010 FIFA World Cup. On matchday one, Obasi made his World Cup debut when he made his first start and played 60 minutes in a 1–0 against Argentina. On matchday three, Obasi set up a goal for Yakubu to score an equaliser, in a 2–2 draw against South Korea, but this was not enough for his side to progress out of the group stages. A year later, Obasi scored his fourth international goal for the side, in a 3–1 loss against Argentina. Since 2011, Obasi hasn't played for the national team, due to injury and being out of form and because he was not release by the club although he was called up on more than one occasion.