Dalot joined United earlier this summer in a £19million move from Porto.
The 19-year-old joins Fred and Lee Grant as Manchester United’s newest arrivals.
The defender is yet to feature for the Red Devils in pre-season so far having undergone knee surgery shortly after arriving at Old Trafford.
However, Dalot is expected to return to full fitness in September having just resumed training with his new club.
Fellow new signing Fred has revealed he will wear the No 17 shirt this term but there’s been no official confirmation about Dalot’s number.
But it seems shot-stopper Pereira has revealed Dalot will wear No 20.
In a snap uploaded to his Instagram story, Pereira showed Dalot wearing the No 20 shirt with the caption: “Soon on the pitch. Baller.”
Ole Gunnar Solskjaer and Robin van Persie previously wore that number during their time with the Red Devils.
Despite not being involved in United’s pre-season fixtures, Dalot is enjoying his experiences with the Red Devils so far.
“It’s amazing. The team-mates have received me very well and I’m so thankful for that,” Dalot told MUTV. “It’s very good to be here. It’s a first experience for me, but I am ready for it.
“I am trying to recover well [from my injury]. Hopefully I’m ready to know them better. They are a great team.”