London - Argentina international centre Gonzalo Tiesi has joined Newcastle until the end of the season, the English Premiership club announced on Wednesday.
The 28-year-old has been capped 37 times by Argentina and was named as a replacement for the Pumas' clash with England at Twickenham on Saturday.
Tiesi's previous clubs include London Irish, Harlequins and Stade Francais.
"Gonzalo adds real quality to our squad, and I'm delighted to welcome him to Newcastle," said Newcastle rugby director Dean Richards.
"The fact that he already has Premiership experience under his belt is a major plus for us, and his international experience is invaluable as we go into a series of big games in the coming months."