The reliable defender returned to training at Carrington on Thursday, following his international exploits with Portugal, which included winning the UEFA Nations League.
As he took part in his first session in the Manchester sunshine in front of our cameras, it was noticeable that he was wearing no.2 rather than the no.20 that he has held since his arrival at the club from Porto in 2018.
We can confirm Diogo is making the switch on a permanent basis, taking over the slot left vacant by Victor Lindelof's exit over the summer.
Of course, the no.2 is traditionally the right-back's number and the 26-year-old has worn it for his country, on occasion.