"He wants more football at the highest level so we are having conversations and discussing the possibility of him staying for the second part of the season". United have been linked with moves for Inter's Ivan Perisic and Real Madrid's Gareth Bale, as well as full-backs Danny Rose (Tottenham) and Serge Aurier (PSG).
However, Mourinho added that one key factor to their title charge at Old Trafford will sharing the scoring load amongst numerous players, as was the case at his previous clubs, and hopes the onus will not be left exclusively on the shoulders of new striker Rolmelu Lukaku. "It's not something urgent, it's not something we're desperate to have done or not done".
"But we have lost important players to injury too, such as Marcos Rojo, Ashley Young, Luke Shaw, and Zlatan Ibrahimovic".
"We have the confidence levels of a team who won a European competition".
Portuguese attacker '90 per cent' certain to join Man Utd
The Belgium worldwide and the Serbian midfielder arrived at Old Trafford from Everton and Chelsea respectively. He was promoted from Oliveirense's first team and his form attracted interest from Jose Mourinho's side.
"What I had in other clubs was more players scoring goals. I think we are ready".
"In my initial analysis from January and through the months I was thinking of four players but I'm not a hard person to work with in spite of if you make it look different", he said at his pre-match presser. "I'm not a hard person to work with, in spite of it looking different sometimes".
"I understand the reality of the market, of the numbers and that my club by doing 75 percent of what I initially asked did very well". I'm not in a position of crying, of moaning, protesting.
Hernandez is now likely to make his Premier League debut for the Hammers against his former club and said of the Red Devils ahead of the game, "It was a great experience [there] ... only happiness". I'll just go with everything I have to try to win every match we play.
Mourinho says he is after another player "coming from the sides" to complete his summer business - leaving the door open for either a winger or a full-back.
"The other 25 percent (of the transfer targets) will be another player playing from the sides. But we have players and if we can not strengthen the team in these areas, we have players that we trust".