Quarterback Dieter Brock, a free agent from the Canadian Football League, has signed a four-year contract with the Los Angeles Rams, whose Coach John Robinson thereupon said the team intends to trade Vince Ferragamo.

"We've talked to Vince and told him we would seek an opportunity to trade him where he will have every chance to succeed," Robinson said. "I think that's probably the right thing for both of us."

Brock, 34, reportedly will receive $2.1 million from the Rams, who apparently see him as a starter, ahead of Jeff Kemp, who led the club to a 10-6 finish and a wild-card playoff appearance after Ferragamo was injured in the third game of 1984 season.

Ferragamo, 30, signed a four-year extension with the Rams last season but was off to a poor start before he was hurt.

Brock, 6 feet, 190 pounds out of Jacksonville (Ala.) State, played 11 seasons in the CFL, 9 1/2 with Winnipeg and the last 1 1/2 with Hamilton; in 1980 and 1981, he won the Schenley award as the league's best player . . .

Guard Herb Scott, twice all-pro, has retired after 10 years on the Dallas Cowboys. Scott, who had knee surgery before the start of the 1982 season, has complained of sore knees . . .

Baltimore Stars running back Kelvin Bryant's hamstring injury worsened yesterday, leaving his status for Sunday against the Houston Gamblers in doubt.