When is deal not a deal, or at least not publicly a deal? When it’s illegal.That appears to be the case with the reported agreement between free agent linebacker Justin Durant and the Dallas Cowboys.ESPN reported Tuesday that Durant agreed to terms on a two-year deal with the Cowboys to compete for the starting job at strongside linebacker.Durant even acknowledged being a Cowboy on Twitter, thanking fans for their well wishes and openly talking about playing in Dallas next year.But the Cowboys have no salary cap room, with just $102,000 of space under the 2013 cap of $123 million, and the deal is reportedly only a verbal agreement until money is made available.Well, that latter part is illegal under the collective bargaining agreement. And a Cowboys team that was fined by the league last year for circumventing the salary cap doesn’t need the league messing with its finances again.According to a league source, if there is an agreement on a contract, it must be disclosed, signed and approved by the league.The Cowboys are not acknowledging a deal with Durant. One source said there was no deal.Durant seems to think otherwise. –– Clarence E. Hill Jr.Briefly • Bears: Veteran cornerback Kelvin Hayden agreed to a one-year contract after making two starts and playing 16 games for Chicago last season. • Browns: Quarterback Jason Campbell agreed to a two-year contract in Cleveland. • Raiders: Tackle Alex Barron signed a free-agent contract after sitting out the past two seasons. He started one game for the Cowboys in 2010, missed the 2011 season with a knee injury and was cut in last season’s Seahawks training camp. • Ravens: Former Broncos defensive end Elvis Dumervil signed his five-year, $35 million deal.