The Red Devils are now in negotiations with Sporting over a move for the 25-year-old and, although the two sides are yet to agree on a fee, a deal is believed to be close.
United's initial €50million offer was knocked back, with Sporting keen to get a fee of closer to €60m.
"We understand the ambition of the player, who prefers to play in a league superior to ours".
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The links with Manchester United invariably resurfaced ahead of the January transfer window, with reports even suggesting that they had opened talks with Sporting Lisbon over a winter move for their captain.
Sporting CP coach Silas understands Bruno Fernandes' desire to play in the Premier League but claimed the Portugal global does not know if he has played his last game for the Lions.
Manchester United are now without Scotland worldwide Scott McTominay and World Cup victor Paul Pogba due to injury.
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"It is now thought Sporting are not totally happy with the structure of the deal and would want more money upfront, but agents' fees may have complicated the payments plan".
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Manchester United are apparently concerned that the playmaker could pick up an injury during the process but Sporting remain adamant that the Portuguese will feature for them so long as no agreement is reached.