With Manchester United's midfield atop Louis van Gaal's checklist of things to fix this summer, the future of two players in particular will be hotly debated topics over the next few weeks.
Both Arturo Vidal and Marouane Fellaini have started their World Cup campaigns boldly, and as a result, both players will likely be targeted for transfers.
Here we take a look at the latest news and rumours surrounding both players:
Vidal did not completely reject the idea of a transfer away from Juventus when quizzed by reporters following Chile's win over Spain, opting to play the World Cup card in his defence and remain silent on his club future.
Ben Gladwell of ESPN FC reports that the midfield superstar sidestepped questions about his future when speaking to Sky Sport Italia, raising doubts about his commitment to the Serie A champions.
When asked if he would remain in Turin next season, the 27-year-old replied, per Gladwell:
"I don't know. I'm happy at Juve, but we're at the World Cup now and I don't want to think about anything other than playing at the World Cup."
Vidal suffered an injury before the World Cup and has played through pain in Chile's opening matches.
But despite this, Vidal was a huge inspiration to his side as Chile knocked out world champions Spain from the competition.
Vidal is widely regarded as the best box-to-box midfielder in European football right now, and Juve will have no intention of losing such a talent, especially if Paul Pogba flees the nest.
The player returned sensational figures in Italian football last season, scoring 18 goals in Serie A and Europe, per WhoScored.com.
It is impossible to rate what transfer value the Chilean midfielder might currently command, but if he and his team-mates venture deep into the later rounds of the World Cup, his potential fee will drive toward one of the biggest in football history.
Vidal would be perfect for Manchester United, and if the Glazers are serious in their backing of new coach Van Gaal, the signing of such a player would be a huge statement of intent.
He might have had a terrible season in his first year at Old Trafford, but Belgium World Cup goal hero Fellaini wants to fight for his place at United.
The midfielder came on for his country as they chased the game in their Group H clash with Algeria, and the former Everton star headed home magnificently to restore parity.
Now, Soccer News (via Sky Sports) reports that Fellaini claims he is not looking to leave the Red Devils and is happy at the club:
Everybody knows my club season was one to forget. I’m the same Marouane. United signed me one year ago. There have been some positives and some negatives, like the bad injury I picked up. Also, our team didn’t quite click into place.
But now we have a new manager, we’ll see what happens next season. In the meantime, I am concentrating on my national team. I don’t play here for a transfer. We’ll see with the new coach, but I still feel good at United.
Fellaini's time at United has coincided with the team's worst run of form in a generation. When you consider how well David Moyes knew the player, his use was seriously mismanaged by the Scotsman.
Phil Neville recently gave his assessment of the player, as reported by Andy Mitten for ESPN FC. Neville has had an insight on the midfielder that many cannot claim, coaching Fellaini last year and having previously played alongside him at Goodison Park:
He came into a team which wasn't clicking or flowing. Maybe being our only signing put pressure on him. He needs a goal. Once he scores that he'll be off and running. We haven't seen the best of him but we will.
The team weren't winning so he was probably thinking 'this is my fault.' He needs to play in a team that wins and he needs to start scoring goals. Nemanja Vidic and Patrice Evra needed six months. Pat got subbed in his first two games. It takes time to settle on and off the field.
Neville is correct, and Moyes' use of Fellaini in the deeper positions simply did not work. United are not blessed with pace in the middle of the park, and Fellaini was hamstrung by this, unable to complement and deliver what the team needed.
Will Louis van Gaal sell Marouane Fellaini this summer?
There is still hope for Fellaini at United, though many fans of the Red Devils irrationally dislike him, viewing him as a trophy of Moyes' short-lived tenure.
Fellaini is not a bad footballer, but he is an unusual one who might not be suited to the style that Van Gaal will bring to Old Trafford.
But Van Gaal has a great track record of turning unpopular players into useful commodities. A transformation of Fellaini would indeed be one of the top Premier League stories of 2014-15.