[3] In the 2004–05 and 2005–06 seasons, he became a regular in Martin Ling's plans, making the central defence position his own and scoring three goals in almost 100 first team appearances for Orient.

In January 2006, Zakuani was part of the Leyton Orient side that defeated Premier League, Fulham 2–1 in the FA Cup third round.

Zakuani later admitted he would like to make a permanent move to Stoke: "The gaffer [Tony Pulis] said he'd like me here so I'll wait and see what happens in the summer.

[13] Zakuani wrote on Twitter, explaining: "I went out on a weekend whether there's no midweek game, those that know me know I don't drink or smoke, I was up at 8am for church the next day.

[16] At the end of the 2012–13 season, which resulted in Peterborough United relegation, Zakuani was placed on the transfer list for the second time after rejecting a three-year contract with the club, due to his increasing international commitment.

[17] On 2 January 2014, Zakuani signed a contract with Kalloni, who are competing in Superleague Greece, the top flight of Greek football.

[18] On 8 June 2014, Zakuani made a return to Peterborough, signing a two-year contract stating: "I missed the club and this feels like a homecoming.

[21] Zakuani signed for League One side Gillingham on a one-year deal on 7 June 2017, after rejecting a new contract offer from Northampton Town.

[25] On 4 October 2019, Zakuani signed a short-term contract with Swindon Town following a long-term injury to club captain Dion Conroy.

[33] His brother Steve is a former professional footballer who came through the Arsenal academy, before playing collegiate soccer with the Akron Zips and for the Cleveland Internationals of the USL Premier Development League.

He then graduated to Major League Soccer and played for Seattle Sounders FC and Portland Timbers before retiring, citing injuries.