Ireland forward Caelan Doris is set to be sidelined for up to six months after undergoing shoulder surgery, his club Leinster said on Monday. The 27-year-old picked up the injury in Leinster's European Rugby Champions Cup semi-final loss to Northampton Saints this month. Doris, who had been vying with Maro Itoje for the British & Irish Lions captaincy, was left out of Andy Farrell's 38-man squad to tour Australia. "Caelan Doris had a procedure on Friday last week for a shoulder injury which