World Cup-winning centre-back Mustafi arrives at the Emirates Stadium with Arsenal supporters full of hope that he can help improve the side's defensive solidity. The 24-year-old, who played alongside Manchester City's Nicolas Otamendi in the heart of Valencia's backline the season before last, is strong in the air despite not being the tallest of centre-halves at 6ft, while his astute reading of the game allows him to sense and prevent danger before it fully materialises.
Slimani gets a goal at the 2014 World Cup
Alonso is set to represent his third Premier League club after joining Chelsea from Fiorentina on Wednesday, the former Bolton and Sunderland left-back having been acquired for £23m. The Spaniard, who has come on leaps and bounds since his time at Bolton between 2010 and 2013, thrived as a wing-back during his time at the Stadio Artemio Franchi and could facilitate a switch to 3-5-2 for Chelsea at some point this season. His set-piece prowess will also come in handy too. Eyebrows were raised at the pricetag, but Alonso has the attributes to be a success at Stamford Bridge.
Alonso made 35 league appearances for Bolton during his three years at the club
The man dubbed the 'Spanish Jamie Vardy' arrives at Arsenal nearly three months after his Leicester contemporary first emerged as a transfer target for Arsene Wenger's side. Lucas netted an impressive 17 goals for Deportivo La Coruna last term and can play anywhere across the forward line, with his speed and aggressive running set to add a slightly different dimension to the Gunners' attack. He hasn’t come cheap at £20m, though, and it's not clear whether he'd get into Wenger's first-choice starting XI when everyone's fit and available.
Southampton have had a somewhat underwhelming start to the 2016/17 Premier League campaign, but the acquisition of Boufal has raised spirits on the south coast. The 22-year-old arrives at St Mary's with a reputation as one of French football’s most promising prospects, with his neat footwork, tricky dribbling and terrific touch making him a joy to watch on his day. “I am attracted,” Boufal said earlier this year, “to players with a similar sort of playing style to me, like Neymar, [Eden] Hazard and [Lionel] Messi.” That statement alone says everything about the level of self-belief and confidence running through his veins.