After making an 11th-hour push to trade for Minnesota Vikings Pro Bowl defensive end Jared Allen before Tuesday's 4 p.m. ET trade deadline, the Seattle Seahawks were not expected to agree to a deal, multiple sources told ESPN NFL Insider Adam Schefter.

The Seahawks are now not expected to trade for Vikings defensive end Jared Allen before Tuesday's 4 p.m. ET trade deadline. AP Photo/Genevieve Ross

The Seahawks have only $2.6 million in salary-cap space, which complicated any ideas of acquiring Allen, who is owed $7.5 million for the rest of the season.

The Vikings have also been talking to a second team about Allen, sources said.

The Vikings are asking for a second-round draft pick but would consider a conditional third-round choice in 2014, a source told ESPN Senior NFL Insider Chris Mortensen.

Allen will be a free agent after the season. If the Vikings don't trade Allen and he leaves as a free agent next spring, they could get a mid-round compensatory pick in the 2015 draft in return.

If the Seahawks had made a deal for Allen, it would have been the second major trade the team would have completed with the Vikings this year, following the offseason acquisition of wide receiver Percy Harvin.

The Vikings received 2013 first- and seventh-round picks, plus a mid-round pick in 2014 from the Seahawks for Harvin, who hasn't played yet this season after undergoing hip surgery before the season.

Allen, a four-time Pro Bowler who turns 32 in April, said earlier this month that the Vikings weren't talking with his agent about a new contract.

Allen has 4.5 sacks this season and 121.5 in his career. The Seahawks stocked up on pass-rushers in the offseason, adding free agents Michael Bennett and Cliff Avril to a defense that also features 2012 first-round pick Bruce Irvin and Chris Clemons.

Bennett leads the team with 4.5 sacks, while Avril has 4, Clemons has 3.5 and Irvin has 2. Defensive tackle Clinton McDonald also is among the team's sacks leaders with 3.5.

ESPN.com Vikings reporter Ben Goessling contributed to this report.