The 29-year old Californian native could be headed back to MLS this year and reports suggest the Union are leading the race.
Recent reports have suggested that former Chivas USA star Kljestan is on Philly's agenda and the clubs technical director Chris Albright did not deny the speculation when speaking to reports on a conference call on Monday.
"As far as players of Sacha's caliber, we're always going to be interested in players of that quality," Albright said.
"We're not going to get into speaking about specific players we're targeting, but I think a player with Sacha's resume speaks for itself. And I think he'd be a great addition to MLS no matter where he'd wind up, if he were to come back."
Defensive midfielder Kljestan has been with Brussels-based Anderlecht since 2010 and has made 175 appearances on his way to three Belgian Pro League titles.
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