The pair were together at Real Madrid and the Brazilian is one of "many people" who have helped the left-back become accustomed to life at Old Trafford.
After a positive debut for the Reds, despite the disappointing 3-1 defeat to Brighton & Hove Albion, Reguilon will hope to make his Champions League bow for the club against Bayern Munich on Wednesday night in our Group A opener.
With Aaron Wan-Bissaka joining Luke Shaw and Tyrell Malacia on the sidelines due to injury, the 26-year-old is looking a shrewd capture.
Speaking to ICS recently, Reguilon explained how he is thankful for the support he has received from our no.