PHILADELPHIA - The Eagles have reportedly added two top assistants following the hiring of former Indianapolis Colts offensive coordinator Nick Sirianni as their new head coach.NFL Network reports the Eagles have agreed to terms with Colts defensive backs coach Jonathan Gannon to become their new defensive coordinator.Meanwhile, the team has also reportedly agreed to a deal that would make former Los Angeles Chargers offensive coordinator Shane Steichen their new offensive coordinator under Sirianni.Gannon brings 14 years of coaching experience to the Eagles after spending the last three seasons with Indianapolis, where he has worked under former Eagles offensive coordinator Frank Reich, who is now the Colts head coach.Steichen also has.