[3] Witteveen did not make any first team appearances for Hearts after Jim Jefferies returned as manager in January 2010.

[6] After completing his loan at Dundee, he began negotiating his exit from Tynecastle and was in discussions with Major League Soccer officials about a potential move to the United States.

[7] After Stirling Albion were hit by an illness crisis, he agreed to play for them as one of their two permitted trialists on 2 January 2011 in a league match against Falkirk.

[9] In January 2011, Witteveen returned home to sign for Austrian Regional League East side SV Horn.

After a series of good performances with SV Grödig, he was offered a contract from Austrian Bundesliga side SC Wiener Neustadt, and agreed to a two-year deal in June 2013.