Tom Court will leave Ulster at the end of this season after agreeing a new long term contract with Aviva Premiership club London Irish.
The loosehead prop said he felt it was "the right decision with regards to me and my career at this stage".
He joined Ulster at the start of the 2006/2007 season and has made 135 appearances for the side.
Born in Australia, but qualified to play for Ireland through ancestry, the 33-year-old has won 32 international caps.
He represented the British and Irish Lions in the summer and played 35 minutes for the tourists in the win over the Melbourne Rebels.
Court played in both the 2012 Heineken Cup Final and last season’s RaboDirect PRO12 final - and was a stand out performer in last month's wins over Leicester Tigers and Montpellier.
"It is going to be very sad when the time comes to actually leave and finish up, but there is a lot of rugby left for me with the Province," said Court.
"There are six months remaining of this season, so there is even more motivation for me to make the most of it while I am here and to try and help Ulster win something."