Manchester United boss Erik ten Hag says his young players need time to prove themselves.
Ten Hag is considering whether to buy in this month's transfer market.
"We signed talent and talent needs time," said Ten Hag.
"You see the progress from [Alejandro] Garnacho and Kobbie Mainoo, also from Rasmus Hojlund.
"You need time but at the same moment, we don't have time. You have to deal with some setbacks but that belongs to the process.
"Is it difficult for me? No, it is not difficult because I could expect it from the start of the season that the process could go negative, then, as a manager, you have to stay positive and get the process in the right direction."