It is thought Mourinho is keen on Monaco right-back Fabinho and Southampton centre-back Jose Fonte, who are both represented by Mendes.
The Red Devils are reportedly keen to bolster their options in defence despite the £30million arrival of Eric Bailly, with the futures of Matteo Darmian, Marcos Rojo and Phil Jones all uncertain.
According to Spanish sports paper Marca, Arsenal are set to announce the signing of Deportivo La Coruna striker Lucas Perez by tomorrow.
The report claims the Gunners have agreed a £17m deal for the uncapped Spaniard following successful negotiations yesterday.
Premier League rivals Leicester and Everton are also thought to have been in the race for the 27-year-old, who scored 17 goals and provided 10 assists in La Liga last season.
After Zagreb's Champions League play-off win against Red Bull Salzburg, the 33-year-old said: "This was a beautiful story, but I got a chance to go to a big club.
"It is the opportunity of lifetime and I think I deserve it. I am leaving Dinamo with the club qualified for the Champions League and I am thrilled with that success."
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