#2 Antoine Griezmann (Atletico Madrid)
The World Cup-winning forward has finally said goodbye to Atletico Madrid, not long after extending his existing deal with the Spanish giants. Numerous reports have suggested Barcelona are the most likely destination for the Frenchman given his release clause, but he's yet to sign nor agree a deal with any club as of yet.
So with that in mind, United could jump on the opportunity to snatch him - albeit at a premium. A complete forward with no real weaknesses in his game, Antoine Griezmann would prove more than enough for the Red Devils to replace Lukaku up-front. The 28-year-old is a proven striker at the top level and despite questions over whether he'd settle in English football, he's certainly good enough to ease quickly and prove those critics wrong once more.
Having won several honours including the aforementioned World Cup and UEFA Europa League, his winning mentality and big-game experience could boost United in their attempts to close the gap on Manchester City and Liverpool next season. With experience playing alongside both Anthony Martial and Pogba for France, his arrival would send shockwaves across the league while potentially securing the latter's long-term future, given their close friendship.