[10] On 13 March 2007, it was confirmed by Catania that Morimoto had ruptured the anterior cruciate ligament (ACL) in his left knee and would be out for at least six months, ruling him out for the remainder of the 2006–07 season.

His performances have often been over-shadowed by the likes of Giuseppe Mascara, Maxi López, Jorge Martínez and Gionatha Spinesi, while the signing of Argentine international Gonzalo Bergessio also limited his chances to feature.

[citation needed] On 11 July 2011, Catania confirmed to have sold Morimoto to newly promoted Serie A club Novara in a co-ownership bid.

[citation needed] On 7 January 2013, Morimoto was loaned to Al-Nasr Dubai, coached by former Catania manager Walter Zenga.

[citation needed] On 14 August 2013, Morimoto signed for J2 League club JEF United Chiba for an undisclosed fee.

In January 2021, Primera División Paraguaya team Sportivo Luqueño confirmed through their president that Morimito was going to arrive to Paraguay to sign for the club.

[19] On 17 April 2021, Morimoto debuted for Sportivo Luqueño against Nacional Asunción in a 1–0 away defeat, being substituted onto the field in the 81st for Guillermo Beltran.

[22] However, the formal acquisition of the player was blocked by a number of bureaucratic issues related to his status as a non-EU citizen, which turned out to be insurmountable and led to the club announcing in January 2024 that the signing could not be completed at last.

On 10 October 2009, Morimoto made his debut for the senior national team against Scotland, coming on as a substitute for Ryoichi Maeda in a 2–0 win.