The Greece international striker has called time on his six-year spell at Scottish giants Celtic and has become the Baggies' ninth signing of a busy close-seasonWest Brom have confirmed the signing of striker Georgios Samaras on a two-year deal.
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And West Brom, who claimed they had "beaten off competition from a host of clubs across Europe" to sign the forward, are delighted with the acquisition.
"We've signed a player with vast experience and I'm delighted to welcome 'Sami' to the club," Irvine told the club's official website.
"He has played a lot of football at the highest levels – Champions League, European Championships and World Cups – and the feedback we've got on him, from people like Neil Lennon, states he thrives on the big occasion.
"He will certainly play in plenty of those in the Barclays Premier League.
"Georgios has played in big games for a Celtic team that have often had a lot of the ball and have had to work hard to break the opposition down.
"But he has also shown another side to his game in other matches when they haven't seen as much of the ball."
The signing of Samaras gives Irvine four forward options, joining fellow new signing Brown Ideye, young striker Saido Berahino and Victor Anichebe, and Irvine is excited by his versatility in attack, adding: "We have now got four strikers with different qualities, who can be used in different ways.
"That's great for us, because we need to have flexibility, the option to approach games in different ways and cover for injuries.
"I'm absolutely delighted with the four strikers we have."
Samaras scored 11 goals in 33 appearances in all competitions for Celtic last term.