The LA Galaxy sewed up a berth in the CONCACAF Champions League quarterfinals without even setting foot on the field on Thursday night.

The Puerto Rico Islanders' 3-0 home win over Isidro Metapán ensured that neither side will be able to catch the Galaxy at the top of Group 5.

The defending MLS champions sit top with seven points from three games. Metapán remain on three points and host the Galaxy in both teams' final group stage match on Oct. 25, now a dead-rubber match. The game was Puerto Rico's last of the 2012-2013 campaign, and the Islanders finish with four points from four games.

Check out the 2012-2013 CCL group stage standings

22-year-old Puerto Rico international Hector Ramos was at the double for the Islanders, scoring on either side of halftime and Guyana talisman Gregory Richardson added one in injury time as Puerto Rico rarely looked troubled.

LA are the third side to seal a quarterfinal berth, after two-time defending champions Monterrey and the Seattle Sounders.

In addition to the Galaxy's progression, the Houston Dynamo also had a stake in tonight's CCL action as group rivals FAS and Olimpia squared off at the Estadio Cuscatlán in El Salvador.

FAS pulled out a 2-1 win over Olimpia, overcoming a one-goal deficit in torrential conditions. It was their final match of the group stage and they will finish last in Group 3 on three points from four games.

Olimpia's loss means Houston, who hold a three point advantage over the Hondurans, simply need to win or draw when the two teams square off at BBVA Compass Stadium on Oct. 23. An Olimipia win, however, would send the visitors through on head-to-head tiebreaker.