Former USA and Fulham attacker Clint Dempsey feels Christian Pulisic needs to use the World Cup as a shop window.
The winger has not received the minutes he would like at Chelsea under both Thomas Tuchel and Graham Potter this season and could look to push for a move away from Stamford Bridge in January.
Dempsey said: "You've got to prove why you should be on the field. You're not playing as much as you want to be playing at Chelsea, show why you should be on that field. The January transfer window is coming up."
Former USA goalkeeper Kasey Keller has also told Pulisic he should consider taking a paycut and leaving Chelsea to progress his career.
"I think part of the issue for Christian Pulisic initially was injuries. It's been two steps forward, two back," Keller said.
"He'd really establish himself, and then he'd get injured. I never have a problem with a player looking for more playing time.
"I understand there is potentially less salary out there than Chelsea, but there's also a part of you that says you have a finite amount of time."
Keller added: "What I'd love to see Pulisic do is win a starting spot at Chelsea, honestly that's what I'd love more than anything but there is a point where he needs to decide what's more important."
