Now back at The Hawthorns, he was a substitute in the Baggies' FA Cup defeat by Reading.
Irvine opted against leaving Deepdale for the Hawthorns, with WBA subsequently appointing Di Matteo.
The Baggies boss accused Chelsea striker Didier Drogba of diving following the Midlanders' defeat at The Hawthorns.
Di Matteo, 39, was in charge at MK Dons for 12 months before succeeding Tony Mowbray at the Hawthorns.
When these sides met at the Hawthorns in October, West Brom climbed into the top four with a 2-1 win.
The Hawthorns erupted when Horsfield beat Ashdown with a volley on the turn just minutes after arriving as a substitute.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
In all he scored 46 times in 81 appearances for the Hawthorns club, and was holding out for a two-year deal.
Roared on by a packed, passionate Hawthorns, West Brom started at a blistering pace and should have scored after just six minutes.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
The final whistle saw a nervous wait but the news of the other results eventually reached the Hawthorns and the celebrations started.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
Former Chelsea midfielder Di Matteo took over at The Hawthorns in June 2009 and led the Midlands club to promotion last season.
Stoke were thrashed 5-0 by Manchester United while the bottom-of the-table Baggies were comprehensively outplayed by Chelsea in their 3-0 home humbling at The Hawthorns.
Mowbray has also watched Swindon forward Simon Cox in action and is keen to keep on-loan Nancy striker Marc Antoine-Fortune at the Hawthorns.
The men from The Hawthorns have outscored every other team in the Championship this season and once again their attacking prowess brought its rewards.
Bednar made five appearances for Leicester in this short time at the Walkers Stadium and says the break away from The Hawthorns came at the right time.
The 19-year-old, who handed in a transfer request last week, has signed a three-year deal at The Hawthorns with an option for a fourth year.
Darren Ferguson's Peterborough side had every right to be hopeful of creating an upset after their impressive draw in the original tie at The Hawthorns.
Norwich manager Paul Lambert selected Steer for the game at the Hawthorns, and seemed more than happy that his faith in the youngster had been repaid.
The former Livingston player had to wait until Roberto di Matteo arrived as the new head coach at the Hawthorns before establishing himself as a first team regular.
Fortune then had an effort disallowed for offside while Ryan Babel and Lucas Leiva both missed chances at the other end in an entertaining enounter at The Hawthorns.
Ledley and striker Jay Bothroyd, who was suspended for the triumph at the Hawthorns, are set to be available for the visit to play-off rivals Middlesbrough on Sunday.
It was an afternoon of drama and tension at the Hawthorns, with emotions ebbing and flowing as scores from the other games were received on radios and mobile phones.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
Arsenal did arrive at The Hawthorns unbeaten in 11 Premier League games but in West Brom they faced a side battling to avoid an immediate return to the Championship and resurgent under new boss Roy Hodgson.
Mowbray, a former Celtic defender, impressed fans at the Hawthorns, despite the club being relegated from the Premier League in England this season - and also at former club Hibernian because of his attacking brand of football.
The win continued the Tigers fantastic start to the season but as the match began at The Hawthorns, it looked like their impressive form may have hit a blip as they found themselves pinned back by West Brom.
West Brom's back-to-back home wins over Tottenham and Manchester City last month dragged them back towards the pack at the foot of the Premier League table, and Greening reckons it is their form at the Hawthorns that will determine whether they can survive.
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