Ireland's Will Addison has returned to training with Ulster after a back operation. 

The former Sale Sharks man underwent surgery in April and was scheduled to return for pre-season training, which he has now done. 

"He's been training, he's training again today so he's fine," Ulster Rugby told RTÉ Sport. 

The 26-year-old full-back/centre had been out of action since hurting his back ahead of training for the 2019 Six Nations campaign. 

Addison was not included in Ireland's 44-man training squad ahead of the World Cup warm-up games, which begin on 10 August against Italy at the Aviva. 

While only Sean O'Brien and Dan Leavy were name-checked as "unavailable due to injury" for the training panel, Ireland boss Joe Schmidt said at the time that "some players have missed out through injury and there are one or two guys that may be added into the squad at a later stage".

The Guinness Pro14 is due to kick off in late September, four weeks later than normal due to the World Cup in Japan. 

Prop Marty Moore, who won the last of his 10 international caps in 2015 has also recovered from an ankle injury and is training with the squad. 

Rory Best, Iain Henderson, Jordi Murphy, Rob Herring, Jack McGrath, Jacob Stockdale and John Cooney are all on Ireland duty.