A very talented, young centreback that has been troubled by injuries througout his career. Vlaar debuted aged 20 for AZ and had since impressed Dutch crowds all over the country, often being named the next Jaap Stam before moving to Feyenoord on a 3 year deal in 2006. During the U21 EC a year later, Vlaar hurt his knee and was out for a long time. The 2008-2009 proved to be a disappoint for Ron too, spending much of the season on the stands with multiple niggling injuries and some bad knee injuries.
Recently, Vlaar has impressed in the centre of defence along with Bahia and Van Dijk; having conceded 0 goals for Feyenoord so far in the 09-10 season.