The 27-year-old was celebrating his brother's impending wedding and said he jumped into a shallow section of water.
Luke Rowe notches a career-best result at De Ronde, but Sky is still searching for an elusive monument victory.
Several notable riders are left off the team's lineup, including American veteran Danny Pate
GCN goes inside with Sky rider Luke Rowe to see how he stocks his rain bag in Spain
Mark Cavendish and Bradley Wiggins will focus their efforts on Tour de France preparations and not compete in their national championships