Angus Bell is one of six players to have picked up an injury in Friday's defeat by Leinster [Getty Images]Ulster continue to count the cost of Friday's 29-21 defeat by Leinster in the United Rugby Championship [URC] with six players added to the injury list for this Saturday's trip to face Munster at Thomond Park [17:30 BST].Angus Bell (foot), Scott Wilson (ankle), Tom O'Toole (hand), James Hume (neck), Jude Postlethwaite (hand) and Bryn Ward (shoulder) have all been ruled out after picking up injuries against Leo Cullen's side.They join a list of unavilable players that already includes Nick Timoney (hip), James McNabney (knee), Rob Herring (calf), Robert Baloucoune (elbow), Rory McGuire (shoulder) and Stewart Moore (knee).In better news for head coach Richie Murphy, Michael Lowry has returned to full training and his availability for the trip to Limerick will be assessed throughout the week.Ulster dropped to fifth in the URC standings following last week's defeat, one point above Munster as the season enters its final three rounds of games before the play-offs.Murphy's side also have a home European Challenge Cup semi-final against Exeter Chiefs to look forward to on Saturday, 2 May as they seek to end their 20-year wait for silverware.