Roma manager Paulo Fonseca has identified Marcus Rashford and Bruno Fernandes as two of Manchester United's main threats that must be stopped.
The Serie A outfit are gearing up for the two-legged Europa League semi-final against United and Fonseca believes his players must shackle Rashford and Fernandes to progress.
He has talked up both United forwards, and Ole Gunnar Solskjaer's men in general, as teams lock horns at Old Trafford tonight (Thursday) for the first leg.
"They have amazing players who can decide in one situation one game and we have to pay attention these individual situations of Manchester United," said Fonseca.
"I think Rashford is an amazing, amazing player. He's having a great, great season. But I think Man United as a whole team are strong.
"But I have to confess, we cannot think to go to Manchester to just defend. We have to have the ball because I don't believe if you think just to defend near our box that we have a chance to beat Man United."
Fonseca is well aware of Fernandes' ability, having come across the Portuguese playmaker when he was playing in Serie A with Udinese.
"Bruno played many years here in Italy and just when he returned to Portugal with Sporting, where he had a great season," he added on the United talisman.
"The people understood the real value from what he did at Sporting, it was amazing. And what he's doing in Manchester is also amazing. He's a player with a strong personality, he wants to win all the time."
The Roma boss then described the two-legged semi-final tie as the biggest challenge of his managerial career to date as the two teams look to book a spot in the Gdansk final on May 26th.
He added: "I have experienced many games in the Champions League but I have to agree that this is the greatest game in European competition.
"To play a semi-final against Manchester United is maybe the biggest challenge in my career and European competitions."