10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations match in February, while Alain Rolland is also included in the Elite Panel in what is his last season.
The 30-year-old has also played 24 times for the Highlanders in the Super 14/15 competition since 2008.
He is immediately available for selection after arriving in Ireland on Tuesday. The Leinster team and replacement to face Edinburgh this weekend will be announced on Friday afternoon.
Commenting on the addition of Newland to the squad, Leinster forwards coach Jono Gibbes said: "We're pleased to sign Clint and he will add experience to the group in place of the injured Stan Wright who, in recent seasons, has been the scrum leader in the Leinster pack."