Houston skipper Wade Barrett has warned his teammates to bring their A-game on Wednesday night if they hope to advance past leg two hosts Saprissa to the CONCACAF Champions Cup final.

The teams battled to a scoreless draw in the Robertson Stadium opener, and the MLS champs are still winless after two league games.

"We can't make those mistakes on Wednesday because Saprissa is a tough place to play," Barrett told the Houston Chronicle.

"We have to be better - I know we have it in us to be better, though."