Injury forces Morris into retirement
The 28-year-old had played in two pre-season friendlies this season but has not featured since. However, having consulted with the Leinster medical team as well as his consultant in the UK, Morris has been forced to retire.
"Unfortunately my ankle, which I fractured and dislocated in an incident against Bath in May 2015 and have rehabbed for 15 months wasn't right after the Gloucester game. So I decided to seek a further opinion and in the end, I've been left with no choice but to retire from professional rugby.
"While at 28 I'm disappointed that my rugby career has come to an end, having completed a degree in Business and Legal Studies at UCD and recently passed CFA Level 1, I feel I am well positioned to make what is a difficult transition and I am excited about what lies ahead.
"I have had some wonderful moments with Blackrock College, with Leinster and of course with Leicester Tigers and I look back upon all those years with fond memories. I am also extremely grateful to Leo and the rest of the Leinster coaching team for giving me this opportunity to prove myself in a Leinster jersey once again.
"It was a great feeling to pull on that jersey in Navan and in Tallaght and I gave it all to get back there and to wear it once more. I wish the team every success for the season ahead. Finally I'd like to thank my family, girlfriend and friends for their support over the last few weeks and indeed over my career," Morris said.
Before re-joining Leinster, Morris played 75 times for the Leicester Tigers – scoring 18 tries in his five seasons. He joined the Premiership side from Leinster in 2011, having played on eight occasions for his home province, scoring three tries in four starts in the Celtic League.
He won a Premiership medal in 2012/13 with Leicester, scoring a try in the Final in Twickenham against Northampton, and had also played for the Ireland Under-20s and for the Emerging Ireland team on three occasions.
"Since Niall re-joined Leinster on a short-term deal, he has worked incredibly hard to get himself back playing at the highest level. We could see during our games against Ulster and Gloucester the quality that Niall can bring to a team so we are very disappointed to hear that he now won't be able to continue playing.
"All the players and staff would like to congratulate Niall on what he achieved in the game and wish him the very best for what he focuses his energy on next," Leinster head coach Leo Cullen said.