As of November 11, 2011
Haskell played for the first time in 2007 for England's Six Nations Men National Team. Previously, he was active for the Saxons, the 7 's team, and for the U21, U19 and U18 selections. Already at the age of 18 he was employed for the first time in the English championship for the London Wasps. In the season 2006/ 07 he became a regular player and came in 25 games of the season are used. In that season the Wasps won the Heineken Cup.
Haskell was ahead of the World Cup 2007 in England squad for the actual tournament, he was not considered. Under the new national coach Martin Johnson he is at the core of the English selection. In November 2008, he played in all games against teams from the southern hemisphere. For the 2009/10 season he left the London Wasps and moved to France to Stade Français. In the season 2011/12 towards Haskell moved to Japan for the Ricoh Black Rams.