Ghana midfielder Mohammed Abu has joined Spanish club Rayo Vallecano on a season’s-long loan deal, MTNFootball.com can exclusively reveal.The 20-year-old joins from English Premier League champions Manchester City who own his transfer rights until June 2014.Abu spent last season on loan at Norwegian top-flight Stromgodset where he hugely impressed.The move to the Spanish La Liga side is aimed at securing regular first team action for the Right to Dream graduate.Abu played for Ghana at the 2012 Africa Nations Cup.