His breakthrough came in the 2006–07 season, being one of Eredivisie's top scorers with 22, and reaching the Netherlands national football team, aged 28.

[1] Late August 2007 Koevermans joined PSV Eindhoven for a fee of €6 million where he received the number 10 jersey, last worn by Ivorian striker Arouna Koné, who was sold to Sevilla FC.

On 29 June 2011, it was announced the Koevermans had reached an agreement to join Major League Soccer team Toronto FC (TFC) as a designated player.

[4] He was awarded MLS Player of the week for his two-goal performance against Colorado Rapids on 17 September, leading Toronto to a 2–1 home victory over the reigning league champions.

"[7] In mid-2012, Koevermans was in fine scoring form but suffered a season-ending ACL injury in mid-July against New England Revolution.