United could do with a calming influence at the back and England hero Harry Maguire has emerged as a serious target after his exploits at the World Cup.
Bayern are prepared to accept around £45million for former Manchester City defender Boateng, who turns 30 next month, but United want to drive the price lower.
Yerry Mina (Barcelona) and Willian (Chelsea) are among those to be linked with a move to Old Trafford. Hence, this time around, they have been in the market looking for a good right winger. "Players are not going to be here on Friday and we have to go with best possible team and with a great mentality".
Both sides were involved in the International Champions Cup in the United States, with the Red Devils faring slightly better than the Bundesliga champions. "We play for points and it's with the players we have", Mourinho told MUTV. "Finally, such a hard pre-season is over".
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Having switched to a 4-3-3 late last term, Mourinho will likely start with the same formation for 2018-19, with new signing Fred set to add the new dimension to their play which should benefit Nemanja Matic and Paul Pogba. If they can't, or won't, United will look slow and stagnant when they attack.
At full-time, the Portuguese compared his youthful team to the raft of talent at Bayern's disposal, including experienced players such as Robert Lewandowski and Arjen Robben. He did, however, say he wants to remain at Chelsea following Sunday's 2-0 Community Shield defeat against Manchester City.
The Premier League transfer window slams shuts at 5pm in three days' time.