The Italian midfielder arrives at Celtic Park six years after AC Milan shelled out �10m for his services.

Although widely touted as one of Europe's hottest properties, his career at the San Siro failed to take off and he spent the majority of his time in Serie A flitting from side to side on loan deals.

When you consider the midfield talent available to the current Champions League holders, it's no shame not to have made the breakthrough.

And he enjoyed regular playing time during his stints with Atalanta, Messina, Parma, Torino and Sampdoria, which suggests he is no slouch.

Averaging ever so slightly more than one strike a season, he is goal machine compared to Neil Lennon, the man he has been brought in to replace at Celtic.

Like Lennon, he is known to favour the simple pass and can provide a good shield for his defenders.

That crucial anchor role may not win many headlines but it will allow fellow new Bhoy Scott Brown to enjoy more attacking freedom, along with established stars like Aiden McGeady and Shunsuke Nakamura.

The 24-year-old Uruguayan midfielder is an unknown quantity, but then, so are Gretna when it comes to the Scottish Premier League.

Yantorno has been capped at under-19 and under-20 level for his country and, following some impressive displays in pre-season friendlies, Gretna boss Davie Irons believes he could use the SPL as a stepping stone to the English Premiership.

The diminutive Montevideo-born player scored a corker in the victory over Darlington and has bagged three goals in the SPL newcomers' warm-up games.

If Yantorno can handle the furious pace and rough-and-tumble of the Scottish top flight then he could be the difference between Gretna's fairytale ending abruptly or continuing for another season.

Possessing lightning-quick pace, the 22-year-old Republic of Ireland international was keen to have a 'sprint-off' with fellow whippet Ivan Sproule for the title of Easter Road's fastest man.

But with Sproule heading south to Bristol City it will be up to O'Brien to terrify SPL defences with his direct, speedy wing-play.

Despite failing to make an impact in six seasons at Newcastle United, O'Brien made his international debut against Holland in August 2006 and has racked up five caps.

O'Brien has the potential to be an exciting crowd-pleaser who will compliment the burgeoning pack of talented young guns at Easter Road.

The 23-year-old hitman was the second-highest scorer in England's League One last season for Oldham Athletic, rattling in 22 goals for the Lancashire club.

He was sought after by several Championship clubs, and Oldham were looking for a six-figure sum for the imposing striker.

But, after a failed attempt by Dundee United to exploit a loophole in the transfer regulations, it was Motherwell who snapped him up for nothing.

Oldham were furious, but the out-of-contract former Bury player was free to move to the Steelmen for diddley-squat because they are a Scottish club.

With an admirable strike ratio in a tough, highly competitive league, Porter should have no trouble replicating his scoring exploits in the SPL - if Mark McGhee's men can supply him with enough chances.

The towering Spaniard arrives at Ibrox with the rare experience of matching himself against some of the best strikers in the world.

During his La Liga days with Osasuna, he has faced up to Ronaldinho, Samuel E'too, Ruud Van Nistlerooy, David Villa, Lionel Messi and the rest.

His partnership with old warhorse David Weir could be crucial to Rangers' hopes of wresting the league title from Celtic, and the tilt at making it through to the group stages of the Champions League.

Cuellar's physical presence will be the beating heart of a more robust Ibrox side and he will hope to make the same impact as the similarly imposing Lorenzo Amoruso - without the Italian's tendency to drift off into distant reveries at the most crucial moments.

And the 25-year-old can cause problems in the opposition box from set-pieces - a fact already proven when he rose to power home a Charlie Adam free-kick in the pre-season friendly draw with Ajax.

The arrival of the Romanian striker is perhaps the most intriguing summer transfer in Scotland.

As a rising star in his homeland, the 26-year-old was whisked off to Sporting Lisbon in 2001 and spent four seasons in Portugal, playing in the 2005 Uefa Cup final.

Injuries disrupted his following spells at Standard Liege in Belgium and Mainz in Germany, where he made just two league starts last season.

However, any man who can boast 12 goals in 28 appearances for a nation that produces as many good players as Romania, has to be the real deal.

If the powerful forward can regain his fitness and form, it shouldn't be too long before Caley Thistle fans are singing about 'Super Marius'.