Signed to a two-year contract by the Vikings at mid-week, wide receiver Koren Robinson was released on Saturday by the team, but only temporarily. The troubled wide receiver, who was jettisoned by the Seattle Seahawks this summer after a spate of alcohol-related off-field problems, was one of several vested veterans leaguewide who were released Saturday for salary-cap and payroll purposes. Under terms of the collective bargaining agreement, a vested veteran -- a player with four or more seasons accrued toward the NFL pension plan -- is guaranteed his full base salary for the year if he is on an opening-day roster. To avoid the guarantee, teams often release fringe vested players before the start of the season, then re-sign them after the opener. That takes a team off the hook for the guarantee and means if a player is subsequently released, the club is responsible only for the prorated share of his base salary. At least three other vested players -- Pittsburgh quarterback Charlie Batch, Tennessee wide receiver Troy Edwards and Denver wide receiver David Terrell -- were released on Saturday to avoid the guarantee. All are expected to be re-signed by the club next week.