Frenkie de Jong
Barcelona had revealed that they would be signing Dutch midfielder Frenkie de Jong as early as January.
The 22-year-old dazzled for Ajax during their impressive UEFA Champions League run - being named Champions League Midfielder of the Year along the way - and is clearly one of the best midfield prospects to emerge in world football in recent years.
Iglesias played his first-ever season in La Liga in 2018-19 and to say that he hit the ground running would be an understatement.
His 17 goals for Espanyol helped the Catalan side secure Europa League qualification and was quickly picked up this summer by Real Betis to lead their front line at the Benito Villamarin. Expect lots of goals in Seville this season.
The former Premier League Player of the Season now plies his trade in La Liga.
Real Madrid made Hazard their blockbuster signing of the summer, presenting him in front of a packed Santiago Bernabeu. Injury has prevented him from making his debut as yet, but big things are expected of the Belgian.
Barcelona signed one of the best attacking players in world football by bringing in Griezmann from rivals Atletico Madrid.
The French World Cup winner was Atletico's top scorer in each of the past five seasons and will now line up alongside the likes of Lionel Messi and Luis Suarez to form a front line that will give defenders nightmares.
Diego Simeone explained that Atletico would try to replace Griezmann by signing a young player who could blossom into a top-class superstar.
The youngster they identified was Benfica's Felix, who quickly whipped up excitement amongst Atletico fans with his performances in pre-season. A jaw-dropping dribble in the 19-year-old's La Liga debut against Getafe caught the attention too, while he scored his first official goal for the club in the third week against Eibar.