Van der Merwe gained a Dutch passport in June 2015, and was selected in the Netherlands squad for the 2015 ICC World Twenty20 Qualifier.

[8] In the Standard Bank Pro20 Series which followed van der Merwe was the third leading wicket-taker with 13 victims at 13.92,[9] he also contributed 192 runs at 27.42.

[12] Titans retained the MTN Domestic Championship in 2008/09 with Van der Merwe again being instrumental to the success, he took 30 wickets at 13.96, 14 more than any other bowler.

[13] Having switched his allegiance to the Netherlands, Van der Merwe signed for Somerset on a two-year contract to play county cricket ahead of the 2016 season.

[24][25] Following the tournament, it was over two years before he made his first-class debut and Van der Merwe has admitted he "didn't take things too seriously" and was "partying all the time".

[26] In August 2008 Van der Merwe was selected for the South Africa Academy to play against their Bangladesh equivalents, in the second of a five-match series he scored 79 from 70 balls and took 6/52.

[27] Van der Merwe played in the 2008 Hong Kong International Cricket Sixes, he was South Africa's leading run scorer and wicket-taker.

[30] Van der Merwe made his ODI debut in the second match of the series at SuperSport Park, he bowled five wicketless overs and was not required to bat.

[33] In 2015, Van der Merwe secured a Dutch passport and was selected to play against Nepal in a four-match series.

[39] In September 2019, he was named in the Dutch squad for the 2019 ICC T20 World Cup Qualifier tournament in the United Arab Emirates.