As the striking National Football League Players Association prepared to ask union workers around the country not to cross its picket lines at NFL games on Sunday and next Monday, a prominent league executive said yesterday that a full season's schedule of 16 games probably will not be possible.

"The networks have indicated that it's going to be highly not feasible to make up the games," said Tampa Bay owner Hugh Culverhouse, executive chairman of the NFL Management Council. "The games now have more appeal to them and advertisers than they will in January.

Most thought yesterday's missed games would be added to the end of the regular schedule in early January. But Management Council spokesman John Jones said NBC has a commitment to broadcast the Bob Hope Desert Classic golf tournament and CBS has lined up an NCAA/NBA doubleheader.

Art Modell, Cleveland Browns owner and chairman of the NFL's television committee, also said he doubts the missed games will be made up. Modell said he believes all three networks will televise the first week of games involving replacement players.

Culverhouse said the most the league probably could expect is a 15-game season. "I wouldn't want to make that {statement} and prejudice my fellow owners . . . but I've read enough now to see where it's highly likely that {a full schedule} will not be feasible," he said.

Interviewed on CBS' "NFL Today," Culverhouse said, "The most you could hope for is we would draw an agreement that we will be back to work, that there will be no more work stoppage this year, and we'll continue to negotiate throughout the year and hopefully have an agreement for next year."

But the NFLPA was working yesterday on making next week's games featuring nonunion players a flop. The NFLPA, which joined the AFL-CIO following the 1982 players strike, will be present with other unions at all 14 stadiums with games scheduled for next week.

The AFL-CIO, which represents 89 unions, is helping the NFLPA contact other unions to request their support in honoring the line.

At RFK Stadium, where the replacement Redskins will play the St. Louis Cardinals on Sunday, striking players will take part in "family day" activities, sign footballs and participate in a rally, according to the NFLPA.

"We're going to ring the stadium with pickets," said M.J. Duberstein, the NFLPA's director of research. The NFLPA expects union members not to cross the line to work at or attend the games, he said.

"I assure you that every union will be contacted, and every union will honor it," he said.

Anyone who does cross, Duberstein said, will be the responsibility of his or her individual union. "It will be up to their union to deal with them. And I'm sure they will take the appropriate action," he said. "We're not asking them to do this as a matter of individual will. This is what their unions have directed. The issue here is not money. The issue is breaking the union."

The National Association of Broadcast Employees and Technicians, who represent approximately 2,800 television employes at NBC and 2,500 at ABC, has not yet announced its plans, according to a NABET spokesman. NABET will wait until midweek when NBC announces its plans for televising the games.

NABET has been on strike against NBC for 13 weeks.

The NFLPA has been successful in getting support from the Teamsters, the AFL-CIO and the United Mine Workers. Friday in Miami, nearly 100 Teamsters walked the picket line with the players. With that support group in place, it is likely the NFLPA now will concentrate on gaining support from stadium employes.

Local 32 of the Food and Beverage Union, which represents the 600 vendors who sell items at RFK for Redskins games, has not decided on its course of action. The local met with the NFLPA Thursday and was told the players union will support whatever decision the local makes.

Spokesmen from the Ford Motor Co. and Chrysler Corp., two of the nation's Big Three automakers, already have indicated they might withdraw some or all of their television advertising if the NFL goes through with the replacement games. The auto companies work on a week-by-week schedule with the networks and will have to make a decision concerning this week's games soon.

The networks and advertisers -- who pay between $100,000 and $200,000 for a 30-second spot during televised games -- could wait until next week to get a reading on viewer interest for the first week of replacement games.

Meanwhile, the two primary negotiators were 3,000 miles apart. NFLPA Executive Director Gene Upshaw was meeting with players on the West Coast and Management Council Executive Director Jack Donlan was in New York.

Jones said that the two sides have not scheduled any sessions and reiterated Donlan's theme that it is "pointless to meet just for the sake of meeting."

Yesterday was mostly a day off from picketing around the league. Denver Broncos union representative Ricky Hunley said his team stopped picketing because negotiations had stalled. Another Denver player, Freddie Gilbert, said he expects some players to cross the picket line if the strike continues.

A similar report came out of Los Angeles, where several Raiders are expected to cross the picket line Monday. Raiders union representative Mike Davis said Upshaw's meeting with the Raiders was "just to answer questions and report on the state of the union." And Al Davis, the Raiders' managing general partner, denied reports that more Raiders intend to cross the picket line.

After a 2 1/2-hour meeting with representatives from West Coast NFL teams yesterday, Upshaw said. "I have players from the Raiders here. I don't think we have to discuss our solidarity. It's there. We are on strike and will remain on strike until we sign a collective bargaining agreement."

Buffalo quarterback Jim Kelly said he would not cross because he feared retribution and would "like to play a couple of more years in this league." Giants quarterback Phil Simms said "star players and the bulk of the players will stay out as long as we have to, as long as Gene Upshaw says we don't have an agreement."

Chicago Bears running back Walter Payton, who has aspirations of soon becoming an NFL franchise owner, was asked what he thought would happen if the striking players scrimmaged against the nonstrikers.

"They'd have to use a lot of body bags," Payton said.