The NFL Players Association has advised agents for the Vikings’ 11 draftees not to sign contracts yet because of specific language in the proposed deals that the union believes violates the league’s collective bargaining agreement.

The Vikings began organized team activities Tuesday without a single pick signed, but all 11 practiced under injury protection agreements.

NFLPA assistant executive director George Atallah said the union supports rookies eager to start their NFL careers but advises them to be aware of what they’re signing.

“We … want to make sure they don’t agree to bad contract language that is not allowed under the collective bargaining agreement,” he said.

Entering OTAs last year, the Vikings had signed all eight of their draftees, and all 10 had been signed at this point in 2015. Sources said their contract language is no different from previous years and that the Vikings, who so far have declined to make changes, do not believe they are breaking any rules.

The Vikings are hardly the only team to have signed less draft picks at this point than in previous years. The union sent a memo last month to agents about language in contracts, and apparently has cracked down more than before on what it considers possible violations.

The injury protection agreements the 11 rookies have been participating under since the start of a May 5-7 rookie minicamp last for seven weeks and could take them through all remaining OTA sessions and the Vikings’ June 13-15 mandatory mini-camp. Related Articles The Loop NFL Picks: Week 2

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If a rookie is hurt before signing a contract, the injury protection agreement requires the Vikings to continue bargaining “in good faith,” meaning the injury should not affect his contract offer. Draftees without signed contracts would not be able to take the field for training camp in late July.

The 2011 collective bargaining agreement established a rookie wage scale for drafted players that has mostly eliminated holdouts. Article 7 of the CBA allows for 13 permissible items in rookie contracts, and the NFLPA believes that language in the Vikings contracts violates this article.

Sources said issues in question have to deal with offset and anti-tampering clauses.

Offset language addresses how much money a team might pay a player if he is waived with guaranteed money left on his deal and then signs with another team. A player, for instance, would want the ability to be paid by both teams while teams would want a commitment not to extend beyond paying any possible difference in the salaries.

While offset clauses are allowed in rookie contracts, a source said there has been an accusation that the Vikings are “conflating offset language with prohibited terms.”

Anti-tampering language relates to when and if an agent might be able to talk to another team about a player still under contract to the Vikings.

If a stalemate were to remain, and there is a risk of missing time in training camp, the NFL has in place a grievance policy.