The Ospreys have completed the signing of former All Blacks Campbell Johnstone until the end of the season.

The 32-year-old will provide some much-needed cover to the team's front row with a host of players currently on the sidelines. The club have also recently signed Cai Griffiths on loan from London Irish.

Rugby operations manager Andy Lloyd told the club's official site: "The arrival of Campbell and Cai gives us some much needed options at tight-head given the injuries we've suffered and the ongoing commitments we have to the national setup at senior and age-grade level.

"Campbell will go straight into our ERC squad on his arrival, and although Cai is ineligible for the Heineken Cup having played in the Amlin Cup this season he will have a big part to play in our PRO12 defence, particularly during the Six Nations period when in addition to our senior national commitments we will also lose two tight-heads to the U20 squad.

"We remain entirely committed to development from within and don't take any decision to look outside the group for injury cover lightly. However, we have a responsibility to our supporters, management and directors to remain competitive, as well as to our players for their personal welfare."

"Given the complete lack of any professional experience in our remaining options there is quite simply no way we could go the rest of the season without bringing in additional cover."

Johnstone has previously played for Crusaders and Biarritz.