Mourinho clearly wanted one, just like Chelsea, Barcelona, Atletico Madrid and Man U did. The only teams out of that list to sign someone are Man U, a player that couldn't play for the first two weeks due to being quarantined away from the rest of the squad and Barcelona who signed Braithwaite a player that 7 months ago was playing for Middlesborough who let's be honest isn't anywhere near what we need, especially for a £15m fee.
Should have signed someone, couldn't for whatever reasons that go on behind the scenes that's just how it is sometimes.