The Vancouver Whitecaps are putting the euphoria of their MLS debut victory behind them as up to four starters will likely miss their next test.

Jay DeMerit, captain of the expansion franchise and anchor of the back line, is expected to miss Saturday’s game against the Union in Philadelphia to play for the U.S. national side.

But coach Teitur Thordarson said after yesterday’s training session that wingers Russell Teibert and Davide Chumiento are also unlikely to play due to injury.

And centre-back Michael Boxall is scheduled to leave for China today to join his New Zealand teammates for another friendly.

“That’s not ideal but that’s the way it is,” said the stoic Thordarson.

Chumiento is out with a hamstring injury and is a key loss after orchestrating the first two goals in Saturday’s 4-2 win over Toronto.

While their depth will be tested, the Whitecaps will be looking to build off Saturday’s win when they face the Union, a second-year expansion team that beat Houston 1-0 in its season opener.

“It’s a huge confidence boost and definitely lets us know that we’re not here just to make up numbers in this league and we are definitely going to push for the playoffs,” Boxall said.