Poulos, (26) a back-row forward, joins after a season in Japan.His four caps include an appearance against eventual champions England duringOctober's World Cup where the Pacific Islanders were on the brink of an upsetwin before losing 35-22.
Staniforth, 26, who can play at either wing or centre, arrivesfrom Super 12 outfit the New South Wales Waratahs, for whom he played 71 timesand with three Australia caps to his name.
Commenting on his move to the Exiles, Staniforth said: "I amexcited about playing in England with London Irish. The club has some outstanding individual players that I amlooking forward to working with and helping it compete for a top three place in nextseason's Zurich (English) Premiership."
London Irish managing director Conor O'Shea said: "We aredelighted to have signed another two international players of the calibre of Peter andScott.
"Over the past fortnight we have announced the signing of sevenplayers, all of whom have won representative honours.
"They represent a serious and necessary improvement in thequality of our squad for next season," the former Ireland full-back added.
"The signings of Peter and Scott are not short term signings.Both players are young enough to integrate into our current squad and as theymature, become a formidable force. The new players will also benefit the young Academy playerscoming through our system by exposing them to different rugby backgrounds, idealsand cultures."
London Irish finished the regular season last weekend eighth inthe 12-team Premiership.
Meanwhile Wales centre Iestyn Harris has ruled himselfout of the June tour of Argentina and South Africa.
The former Great Britain rugby league international has a kneeinjury and needs at least six weeks to get over it.
That means he won't be ready in time for the two Test series inArgentina on June 12th and 19th and the one-off match against the Springboks inPretoria on June 26th.
"I am pretty devastated to be ruled out. I had earmarked thetour to really make a claim," Harris told BBC Wales yesterday (Tuesday).
"I've got severe bruising in the shin and quad bones, andI've also got a
"It has been an extremely long year, with the World Cup.We've been playing international rugby since July last year.
"There is only so much a body can take at that level, andover the next two or three weeks, you will see plenty of players dropping out of tours- not just for Wales, but for every country that's going on a tour,"Harris added.
Harris's absence adds to the list of problems facing new Walescoach Mike Ruddock, with shoulder injuries set to sideline Llanelli forwardsDafydd Jones and Robin McBryde while half-backs Stephen Jones, Gareth Cooper andRyan Powell have all to prove their fitness.
Ruddock has been due to reveal his tour squad on Thursday but the announcement has now been delayed until early next week following thefinal round of Celtic League matches.
England World Cup-winning prop TrevorWoodman has joined Sale from Premiership rivals Gloucester on a three-year deal.
The move sees Woodman, 27, capped 20 times by England, liking upwith former Gloucester turned Sale director of rugby Philippe Saint-Andre.
Saint Andre, a former France wing, said: "Trevor is a classplayer who will fit in perfectly with my plans at Sale Sharks.
"With Andrew Sheridan who is on the fringe of the Englandteam we will have two great open side prop forwards to work with. Trevor's signing alsogives us extra strength in depth in the front five."
Sale chief executive Niels de Vos added: "When we were firstalerted to Trevor's possible availability we resolved to do everything we couldto secure his services. World Class Prop Forwards of his ability and age comeup all to rarely.
"Fortunately for us when Kevin Yates decided to leave us forSaracens, the wage budget became available to agree a deal with Trevor, helped byhis desire to link up again with former coach Philippe Saint-Andre."
Also joining Sale is John Payne, a 24-year-old Tonga internationalcentre who arrives on a one-year deal with an option of an extension.
Saint-Andre said of Payne, capped 10 times by Tonga: "John isa highly competitive centre who was vice-captain of his country in lastautumn's Rugby World Cup. He is young and was very keen to join Sale Sharks."
Sale, beaten finalists against Newcastle in this season's EnglishCup final, finished seventh in the 12-strong Premiership.