"Morgan is an intelligent attacking player who will provide cover for us across the back three," said Wales assistant coach Rob Howley.
"He is a player we know very well and just as importantly he knows our squad environment very well and should be able to slot into things fairly quickly."
Stoddart last played for Wales in their victory over Canada during the Invesco Perpetual Series 2008 and won his other two international caps against South Africa, making his debut against the Springboks on Wales' summer tour in 2007.
Morgan STODDART (SCARLETS - Cap No 1,056)
DoB: 23.09.84. 6'1" / 1.86m. 14st 13lbs / 95kgs
International record: 3 caps (W 1, L 2; 10 pts - 2T)