While Ronan play as a left back for his national team, he has been mainly used as a centre back at Citizen. He has also played in the left midfield position due to injuries in his team's attacking line.[2] On 29 March 2008, Ronan scored his first goal for Citizen with a header, helping the team to a 1–0 victory over Kitchee SC in the First Division. He subsequently scored another goal from a penalty kick on 5 April 2008 to help Citizen to come back to win 2–1 against South China AA. He then scored from another penalty kick in a 2–4 defeat to Eastern AA on 13 April 2008, taking his tally for the season to 3.
Ronan missed the FA Cup 2007–08 final after being sent off in the semi-final against Eastern AA on 5 May 2008 for receiving two yellow cards. In the final, Citizen went on to win the cup with a 2–0 win over Wofoo Tai Po.
Germany
On 1 July 2009, Ronan signed with German Verbandsliga Sachsen-Anhalt club Lok Stendal.[3]
International career
Ronan made his Equatorial Guinea national team debut on 26 February 2006 in a friendly match against Benin in Cotonou. That day the National Nzalang (the nickname of Equatorial Guinea national football team) won by 1–0.[1] On 1 June 2008, he scored the first goal in a 2–0 victory over Sierra Leone.