New Manchester United head coach Ruben Amorim says he is under "no illusions" as to the difficulty of the job facing him at Old Trafford.
The 39-year-old was appointed on a two and a half year deal earlier this month.
While he officially starts his role at Old Trafford this week, a work permit issue means Amorim will be unable to hold training until he is granted a visa.
Amorim signed off from his time at Portuguese side Sporting with a 4-2 win against former club Braga on Sunday night.
"I feel ready for the new challenge," Amorim told reporters after the match.
"I'm not naive, I know it's going to be very different, very difficult.
"I'm at peace now. I can focus on my new job and I'm looking forward to starting tomorrow.
"I know it will be difficult to reproduce what I have here anywhere else but there are other places with different exposure and pressure."