The Giants are no longer allowing Osi Umenyiora and his agent to seek a trade, according to sources. New York gave the defensive end and agent Tony Agnone permission to seek out a trade earlier this week, but that window has now closed. Agnone was unable to find a trade partner willing to surrender a first-round pick to the Giants in return for the disgruntled defensive end, who is seeking a new contract to replace the one that has nearly a total of $8 million remaining on the final two years.