Musavu -King in 2010 was recorded as a 18- year-old in the reserve team of SM Caen, after earning his high school diploma in the same year. He was able to establish itself in this but only during the 2011/12 season. After the first team in 2012 was relegated to the second division, the Gabonese signed his first professional contract with Caen and marched with it to the first team. Even if an injury break his pre-season nullified, he succeeded for this on November 23, 2012 in a 1-0 against SCO Angers his second league debut, where he was employed over the full 90 minutes. Subsequently, it was still used primarily in reserve selection. In September 2013 he was awarded for one season at third division ES Uzès Pont du Gard.
A few months after his jump in Caen's first team Musavu -King was first considered for an international match of the Gabonese selection. At 0-1 against the Republic of Congo, he made his debut and was standing directly in the starting lineup.