Chelsea have signed Atletico Madrid striker Joao Felix on loan for the rest of the season for a fee of 11 million euros (£9.7m).
Felix, 23, has also signed a one-year extension to his Atletico contract until June 2027.
Boss Graham Potter said injuries had "sharpened" Chelsea's focus in their pursuit of the Portugal international, with Christian Pulisic ruled out for a couple of months.
"He's a quality player," said Potter.
"He will make a difference in the final third of the pitch and I'm looking forward to working with him.
"He's young, but still has lots of good experience and it's given us all a bit of a lift.
"I've been aware of the potential deal for a while but the injuries we've had maybe sharpened our focus on it.