Jack has been a valuable addition to Saracens this season (Getty)

Saracens' former All Black second row Chris Jack has been ruled out for the rest of the season with a hand injury.

The 29-year-old damaged tendons during a fall in Saracens 30-3 EDF semi-final defeat to the Ospreys on Saturday.

The injury means Jack will miss the club's Heineken Cup quarter-final against the same opposition on 6 April.

Saracens director of rugby Alan Gaffney said: "It's a blow for the club and more importantly for Chris, who has quickly settled in England."

He added: "He has been producing some very good performances for us, but it's something that we have to deal with."