Early years Born in
Nakuru,
Kenya, However, he didn't start playing football until the age of 13, as a student at Oak Farm School in Farnborough. Around this time, he also became involved in athletics, representing
Surrey in the
English Schools Championships, winning silver in the
triple jump. and
Birmingham City. Osano joined
Aldershot Town in October 2006 on a month-long work experience deal, which was later extended. He then joined
Woking in January 2007 on work experience until the end of the
2006–07 season.
Rushden & Diamonds The right-back joined
Rushden & Diamonds for the
2007–08 season on work experience. He joined Rushden on a two-year contract in July 2008 following his release by Reading. He scored his first career goal in a game against
Altrincham in November 2008. He was released by Rushden in May 2011 due to the club's financial difficulties, having made over 160 league appearances for the club in total. Following his release by Rushden, he was taken on trial by
Championship side
Brighton & Hove Albion and participated in their first pre-season game of 2011 against
Burgess Hill Town. He played the first 45 minutes of the match but his stay with the club proved to be short-lived, following the signing of
Romain Vincelot from
Dagenham & Redbridge. During this period Osano sought work in a recycling centre to help make ends meet, staying with his former
Frimley Green youth manager, John McDonnell as he searched for a new club. Luton Town extended his contract until the end of the season following strong performances for the club, with manager
Gary Brabin said of Osano "Curtis has been excellent for us. He's a great athlete, has bags of enthusiasm, is a hard-worker and loves to get forward." He featured prominently for the club throughout the
2011–12 season and was a member of the starting eleven that competed in the
2012 Conference play-off final defeat to
York City on 20 May 2012.
AFC Wimbledon On 28 May 2012, Osano left Luton to sign for
League Two side
AFC Wimbledon, where he once again linked up with former teammate
Will Antwi. Osano had an unfortunate start to the
2012–13 campaign when he picked up an ankle injury that prevented him from taking part in the first eight games of the season. He finally made his debut for AFC Wimbledon as a late substitute in a 2–1 loss against
Accrington Stanley on 29 September 2012. On 14 May 2013, Osano was released from his contract and left AFC Wimbledon having made twenty appearances in all competitions for the club.
Bengaluru FC On 16 July 2013, Osano joined
I-League side
Bengaluru FC on a free transfer. Speaking of his move to
India Osano said: "I love challenges and the idea of getting into a league with a completely different style of football intrigued me. The manager is trying to bring a different brand of football and I consider it a once in a lifetime chance, a blessing that's fallen in my lap." He made his debut for the side in their first ever
I-League match on 22 September 2013 against
Mohun Bagan A.C. in which he started and played the full match as Bengaluru drew the match 1–1.
Return to England After three seasons in India, Osano returned to England, reportedly to sign with the
Isthmian League,
Hayes & Yeading United. However on 28 July 2016 it was announced that he had signed instead for
Farnborough. ==Later years==