كتب : Omar AbdelAziz
The Egypt wing-back claimed 47% of the vote, surpassing Paraguay's World Cup midfielder Cristian Riveros, who joined from Cruz Azul.
Al-Muhammadi showed steady form during the Black Cats' pre-season so far, impressing in friendlies against Benfica and Leicester City recently.
The 22-year-old, who signed from ENPPI, is pushing for a place in Steve Bruce's starting eleven as the Premier League season approaches.
Sunderland open their campaign at home against Birmingham on the 14th of August.