#2 The young and quick attacking line
Yes, going into the new season, Manchester United seem to have one of the quickest forward lines in the league and after the inclusion of Daniel James, the pace in the United attack has increased.
James was the quickest forward in his days with Swansea in the Championship, and with the likes of Anthony Martial, Marcus Rashford, Romelu Lukaku, and Jesse Lingard, Manchester United could form a fiery front line which is deadly on the counter-attack.
The biggest concern that Solskjaer would look to tackle in the pre-season is the stamina of his attacking players which would directly improve the quality of the pressing. It would be interesting to see what attacking line Solskjaer prefers and who between Lukaku and Rashford will be his first-choice striker.
Also, how Daniel James fits into this team will be great to see. Right now, I think he would be tried on the right wing and I am also pretty excited to witness Mason Greenwood, Tahith Chong, and Angel Gomes get their run out.