 He completed three of six passes for eight yards, was sacked, and threw an interception in the Chargers' 24-0 loss against Denver.Before the 1988 San Diego Chargers season began, Dan Fouts chose to retire from the game after 15 seasons, leaving Vlasic as the main backup to starter Mark Herrmann, and as a result the Chargers began trying to trade for an experienced quarterback.The Chargers also signed Mark Malone and Babe Laufenberg to compete for the starting job, and traded Herrmann to the Indianapolis Colts.