The 28-year old midfielder joined from Irish club Sligo Rovers in January 2012 but could be on his way out the Tannadice exit door according to his current boss.
"I have told Richie it's going to be difficult for him to get into the team," McNamara told the Dundee Courier.
"I could keep him as cover but that's not fair because he needs to be playing football.
"There is nothing happening yet but I am hoping we get something sorted with him soon. We are well covered in midfield and have youngsters coming through."