The 33-year old former St Johnstone and Greenock Morton forward comes out of contract with the Scottish championship club this summer and is believed to be pondering a move away from Dens Park.
"He is free in the summer and it is expected Dundee will make an offer," Ashgar told Sky Sports.
"I am working closely with agent Jonathan Hope who has two interested parties in the MLS so we will explore these options."
Hope added: "Yes I am working closely with Tony and recently finished a scouting mission in the USA.
"Peter is an attractive striker and I'm now hearing a meeting with Doncaster is to be set up.
"When you score goals you create attention and Peter has done this."
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