The 24-year-old previously played under Adams for Ross County in the second half of the 2013-14 Scottish Premier League season. Yann joined the Staggies on loan from Championship side Blackburn Rovers and played 17 times, scoring three goals, as County finished seventh in the Scottish top flight. The Cameroon Under-20 international returned to Ewood Park for the second year of his two-year deal but played only once more for Rovers, in a Capital One Cup defeat by Scunthorpe United before being released.
After trialing with League 1 Shrewsbury last summer, Yann was without an English club but has become a familiar face around Home Park, training with the Pilgrims while waiting to link up with his former manager again. Born in Toulon, France, Yann began his career in the youth team of Spanish La Liga side Deportivo La Coruña, for who his Cameroonian World Cup goalkeeper father Jacques played between 1996-2004. After spells in the youth ranks at French side Metz and back in Spain with Real Zaragoza, he played lower league Spanish football for Sabadell and Pobla de Mafumet before signing for American MLS side Sporting Kansas City in 2012. He was then loaned to third-flight side Orlando City for who he played 12 times, scoring once, before concluding his Stateside career.
He joined Blackburn on a two-year deal in the summer of 2013 and made his debut in a 3-3 Capital One Cup tie at Carlisle United, his only appearance for the Lancashire side prior to moving to Ross County for the second half of the season. As well as father Jacques, Yann’s brother Franck was also a professional, who played in the Premier League for Portsmouth between 2005-08 as well as having loan spells at Bournemouth, Preston, Crystal Palace and Sheffield Wednesday. He also played for Zaragoza and Albacete in Spain and Portland Timbers in the USA.