The attacker will be plying his trade for the Blues next season after his £58m January move from Borussia Dortmund.
Pulisic was sent back to the German club on loan until the end of the season.
But Chelsea fans will be excited for the 20-year-old to arrive in west London following his showing this week.
During a clash between the USA and Ecuador on Friday, Pulisic put on a show for fans in attendance – and left United right-back Valencia for dead on more than one occasion.
In one clip, which has now gone viral via social media, the Chelsea loanee has the ball at his feet near the corner flag and allows Valencia to close him down.
The United star obliges – and the pair both remain still in a tense stand off.
But in a flash Pulisic shimmies away from Valencia and into the penalty area.
And it’s safe to say football fans were in awe at what they saw.
In other Chelsea news this week:
“Did anyone clip Pulisic just murder Antonio Valencia?” one tweeted.
“Pulisic just schooled Valencia. That was amazing! #USMNT,” another wrote.
“Pulisic just broke Valencia’s ankles,” one said.
“Pulisic literally just ran circles around Antonio Valencia,” another added.
“Lmao Pulisic smoked Valencia,” a fifth wrote.
“RIP Valencia… Christian Pulisic just put you six feet under,” one said.
“PULISIC JUST STOOD UP ANTONIO VALENCIA AND BLEW BY HIM WITH EASE,” another tweeted.
And USA legend Brian McBride thinks Pulisic will fit right in at Chelsea.
“With the speed of the Premier League, I think Christian Pulisic will fit in and settle in well,” he told Us-bookies.com
“He adapted very well as a young player in Germany and in the Champions League.
“He hasn’t shown any weaknesses so far.
“Right now, he’s probably not in the best form of his career as he isn’t playing each week, but the talent is there and his thought process is very quick.
“He’s a very mature young player and has a desire to continually improve.
“When you have that kind of mentality, you can deal with the physicality in the Premier League and at a team like Chelsea this will help him settle in.”