Following good performances at
Mighty Barrolle he was voted
most valuable player of the 2007 season, and also became team captain of the
Liberia under-20 national football team. This drew the interest from several clubs, such as
A.C. Siena and
Portland Timbers, however following a trial with
Allsvenskan club
IF Elfsborg, he decided to sign for the Swedish team. Spending the
2009 season in the U-21 team he was signed to a first-team contract prior to the
2010 season. On 22 March 2011, he was loaned out to Allsvenskan rivals
GAIS, following a severe injury to fellow Elfsborg player
Mohammed Abdulrahman who was on loan to GAIS. On 1 July he signed with the Swedish
Superettan club
Degerfors IF, a contract that was to expire at the end of the 2011 season. On 4 October 2011 he signed a new contract with Degerfors, keeping him at the club for two more years. In November 2013 he signed a three-year-long contract with
Hammarby IF, leaving Degerfors as a free agent. In August 2015, Rennie completed a season-long loan deal with Norwegian side
Brann, with striker
Jakob Orlov moving the opposite way. ==National team==