This is the week that Los Angeles brings its unbeaten record to its least-favorite place - Bloomington. Minn. - and the Pittsburgh Steelers expose their unbeaten mark to the vengeful-minded Browns in Cleveland.

Greg Pruitt comes off the injured list for Cleveland, as does Bert Jones for Baltimore, which will play the New York Jets. Also, Bob Griese will be ready to replace Don Strock for Miami at San Diego.

Guard Tom Mack, the Ram with the most seniority after 13 seasons, was asked to account for Los Angeles winning only once in Bloomington (in 1968) in the last 10 regular or post-season games there.

"I wish I knew," he said. "I've honestly felt we've outplayed the Vikings almost every time up there. But we haven't put the points on the board when we've had the chance, and I have to take my hat off to them because they made the big plays to beat us. The series has been the most frustrating aspect of my career."

The Vikings currently are having their troubles with a 3-3 record, tied with Chicago and Tampa Bay two games behind Green Bay in the NFC Central. Chuck Foreman is expected to play after missing two games with a strained knee.

The Browns, 4-2 and in second place in the AFC Central, are still indignant over an incorrect official's call that denied them possession of a fumble by Pittsburgh of the opening kickoff in overtime, when the Steelers won, 15-9. Since then, the Browns have added running back Calvin Hill and expect Pruitt to start today.

Quarterback Griese looked sharp Monday when he threw four pases in a relief role in his 1978 debut with Miami (4-2), but Coach Don Shula reportedly will start Strock.

New Coach Don Coryell of San Diego (2-4) commented: "I'm not doubting Shula, but I can't believe that."

The Chargers upset defending AFC champion Danver, 23-0, last Sunday as running back Lydell Mitchell had his first big day since being traded by Baltimore.

Coach Ted Marchibroda of Baltimore (2-4) said of being without quarterback Jones for the first six games: "We feel Bert will be ready to play. From all indications, his shoulder (separation) is healed."

The Jets (3-3) are playing without their starting quarterback, Richard Todd, who suffered a broken collar-bone against the Redskins Sept. 24. Matt Robinson has replaced him.

The Monday night game pits the Bears (3-3) against the Broncos, now tied with Oakland at 4-2 at Denver.

Green Bay (5-1) plays Seattle (3-3) at Milwaukee, Earl Campbell leads the Oilers (3-3) against Terry Miller and Buffalo (2-4) at Houston; Kansas City (1-5) is at Oakland; New Zealand (4-2) is at Cincinnati (0-6); Dallas (4-2) at St. Louis (0-6); Detroit (1-5) at Atlanta (2-4); New Orleans (2-4) at San Francisco (1-5); Tampa Bay (3-3) at East Rutherford, N.J., against the Giants (3-3) and Washington (6-0) is at Philadelphia (3-3).