I do believe that Manchester United should include one or two new players and give them a chance to see how they fit in the team. The performance of them is on the decline and we are seeing this in this season where they have won only 5 matches in premier league and lost 6 matches. They aren't in the top 10 teams currently on the points standing and it is obviously against their standard. Also keep in mind, just bringing new blood in the team won't have an immediate effect but in the long run, it will be beneficial for the team.
Not many managers can join a team and make use of the old players there to get success, they have to alter the team by selling some, loan others and bring in their own players to get better results. In January when the transfer window opens, we should be expecting Manchester United to be very busy in the transfer. Even though they don't bring in the players that we are expecting, atleast they have to let go of alot of flops that they have currently at the club that isn't contributing anything to the team but only receiving salary weekly and making Manchester United to be at a lost. The summer transfer should be when the buying of players should be active.