The 23-year-old could be tempted by a move to Old Trafford after finding himself increasingly on the fringes of Thomas Tuchel’s squad.
Pulisic is frustrated with his lack of minutes under Tuchel and is considering leaving Chelsea.
The United States captain, who has less than two years on his contract and cost Chelsea £58million in 2019, wants more regular football ahead of the World Cup in Qatar this summer.
United are also reportedly interested in Hakim Ziyech, as well as Callum Hudson-Odoi.
Their interest in Pulisic stems from the fact that Chelsea have several disgruntled attacking players who believe Tuchel’s system inhibits their ability to be effective attackers, favoring defensive solidity instead.
Chelsea are pressing ahead with their bid to sign Anthony Gordon from Everton on a key day of talks between the two clubs.
Hudson-Odoi could leave on loan, with Newcastle joining Dortmund, Leicester and Southampton in the race to sign him.
Ziyech is still keen on leaving the Stamford Bridge side as AC Milan are no longer interested.