Edinburgh have signed Samoan international scrum-half John Senio until the end of the season, subject to the 24-year-old passing a medical.
John Senio previously played for the Blues in New Zealand
Senio had been with the Blues in New Zealand for two seasons.
Edinburgh head coach Lynn Howells said: "We identified that number nine was an area we needed to strengthen."
Meanwhile, Mike Pyke has moved to Montauban Tarn et Garonne in France and fellow Canadian international Ander Monro to Waterloo in England.
Senio, capped 10 times for Samoa, played in the Super 12 and the Super 14 and has represented Northland in the New Zealand NPC since 2004.
"The CV and DVDs we've seen show John will add strength in depth to the squad," said Howells.
John Senio has the ability to play at a high level
Edinburgh head coach Lynn Howells
"To secure the services of a player of John's stature at this time of the season is a real positive for Edinburgh.
"It's not an ideal time to bring in players because there's such a short time before we're into the Heineken Cup again.
"But he will bring valuable experience during the Six Nations working alongside our young players at a challenging time when we will be without key personnel.
"He has been involved in one of the top competitions in the world and, having spoken to his former coach, Graham Henry, he has the ability to play at a high level."
The Canadian pair have left Edinburgh due to a lack of games for the Magners League side.
Edinburgh executive chairman Alex Carruthers said: "Edinburgh were not in a position to offer as much game time as the two players wanted, so the move will benefit their playing career and prospects ahead of next year's IRB Rugby World Cup.
"Mike and Ander leave with Edinburgh Rugby's best wishes and thanks for their contribution to the club.
"We wish them well for the World Cup and beyond."
Winger Pyke will be playing in the French Top 14, while stand-off Monro, who will be on loan until the end of the season, will be in the English First Division.