Ruben Amorim admits that need to be 'careful' with after he suffered a 'small' injury setback.

Shaw, 29, made three consecutive substitute appearances in Amorim's first three games as manager before . The international but that Shaw would miss Friday's fourth-round clash at home to .

Speaking ahead of the cup tie, Amorim confirmed that Shaw had indeed suffered a setback in his recovery, revealing: "Luke has one small issue in a different area from the last injury, so we try to be careful with Luke."

The Red Devils boss also commented on the news that had suffered a cruciate ligament injury during at home to . "Licha is a difficult situation, he's going to be out for a while," Amorim explained. "We don't know the extent of the injury, but it's going to take time."

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United signed a new left-back in the to compete with Shaw, who's only played eight times for club and country in the past 12 months. Patrick Dorgu, 20, arrived from Lecce in a £25million deal, having impressed for the Italian side as well as the .

prospect Ayden Heaven was also brought in and Amorim has suggested that the 18-year-old centre-back could play a role in the first-team. Quizzed on whether they could make their debuts against Leicester, Amorim replied: "We'll see, you guys have to wait until tomorrow but they are ready to play and are two more solutions in this moment."

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Despite calls to sign a forward following the departures of and , the two defenders were United's only additions of the transfer window, with the Red Devils wary of breaching the Profit and Sustainability Rules after years of overspending and selling players on unfavourable terms. "What I feel is that the club is taking its time," Amorim said.

"We know the urgency of the moment of the team, everybody here don't want to make the same mistakes of the past, in the summer we will see. But like I said, we are being really careful with transfers because we did some mistakes in the past."

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