[2] In January 2003, he was included in the first-team squad by head coach Johan Neeskens for their training camp in Alanya, Turkey.
He suffered an injury in his upper leg in a pre-season tournament in Den Helder in July 2006, keeping him out for the start of the season.
[8] Despite suffering a knee injury, Otten signed permanently for his first club NEC in June 2007, penning a four-year deal.
[9] In the 2007–08 season Otten regained his place in the starting lineup of NEC and in the opening game of the 2008–09 he made his official return to Eredivisie action.
[11] In February 2014, he was demoted to the reserve team of the club, alongside fellow countrymen Jack Tuijp and Arsenio Valpoort after the firing of Dutch manager Ricardo Moniz.
[17] While playing for NEC, Otten worked as a youth coach at RKSV Brakkenstein, and was appointed assistant manager of the first team after his retirement as a player in 2014.