|Date of birth||March 26, 1991|
|Place of birth||Marseille, France|
|Height||1.74 m (5 ft 8 1⁄2 in)|
|1999-2003||Olympique Saint Maximinois|
|2011–2012||→ Aviron Bayonnais (loan)||3||(0)|
* Senior club appearances and goals counted for the domestic league only.
Kevin joined Marseille when he was 12 from Olympique Saint Maximinois. He went through their youth system, winning many youth trophies, including "Championnat National des 16 ans" (Under 16 National Championship), after reaching with his team in 2008 the Under 16 final stage for the first time in Marseille's history. He went on to join Marseille's first team in 2009, after signing an "Elite" contract (2 years as a trainee and 3 years as a professional). His first professional match with Marseille was against AEL Limassol in the UEFA Europa League
Osei penned a six-month deal with the option to extend on July 28th, 2015 with English League Two club Carlisle United following a successful trial spell.
Osei has expressed his desire to play for Ghana. He was meant to take part in the 2011 African Youth Championship, but because of delays in obtaining his Ghanaian passport, he wasn't eligible to play for the Ghana U20 national team. He continues to follow Ghanaian national teams in every competition they are engaged in.
- Effectif pro - OSEI (in French). om.net (Olympique de Marseille).
- Autres championnats (in French). fff.fr.
- Le Journal des Jeunes (in French). om.net (Olympique de Marseille).
- Kevin Osei. lfp.fr.
- . UEFA.com.
- ]http://www.waasland-beveren.be/2015/01/w-b-verwelkomt-twee-nieuwkomers-de-belder-en-osei/] Beveren Official Website
- ]http://www.rtbf.be/sport/football/belgique/jupilerproleague/detail_waasland-beveren-recrute-dylan-de-belder-et-kevin-osei?id=8827691] rtbf.be
- ]http://www.carlisleunited.co.uk/news/article/striker-kevin-osei-signs-six-month-deal-with-carlisle-united-2575418.aspx] Carlisle United Official Website.
- Kevin opts for Ghana. gfmsports.com.
- Talk show le phoceen 27/05/12. lephoceen.fr.
- . ghanasoccernet.com.
- Kevin Osei dropped for Ghana African Youth Championships squad
- . ghanasoccernet.com.
- Osei et ndoumbou bientot pros. lequipe.fr (French)
- Entretien avec Kevin Osei je suis a 100 marseillais. lequipe.fr (French)
- Om deux renforts pour le futur bientot signes. footmercato.net (French)
- Les yeux dans Osei. footmercato.net (French)