Van Persie arrived at United from Arsenal for an initial £22.5 million fee in 2012, signing a four-year deal. He netted 26 times in his first 36 Premier League appearances, to help the Red Devils secure the title.
The 23-year-old was widely expected to depart Stamford Bridge permanently this summer, after spending four years out on loan, since signing for the Blues in 2012.
The 32-year-old's current contract at Stamford Bridge runs out in the summer, and is free to sign a pre-contract agreement with foreign clubs from January 1.
KlutchSports twitter post This is the second time LeBron is leaving the Cavaliers, the first in 2010 for Miami Heat where he won championships in both 2012 and 2013, before returning to Cleveland in 2014.
"For instance, the contract for this federal secretariat was awarded in 2012 by the previous administration without making funds available for its completion.
He joined Real from Tottenham in 2012 and has gone on to make 436 appearances for the Spanish giants, winning the Champions League five times and three La Liga titles.
Alex Song spent six years at Premier League side Arsenal before joining Barcelona in 2012, but he was unable to establish himself at the Camp Nou and was loaned to West Ham United where his contract expired.
Hazard, whose Chelsea contract expires in 18 months' time, has been in England since 2012 and won every major domestic honour available to him. "Why not? I've seen all there is to see.
The Belgium defender, whose contract was extended in June until the end of the current season, made more than 300 appearances for Spurs after joining the club from Ajax in 2012. "So my time at the club comes to an end.