Romero helped United win the Europa League last season, playing in the majority of games including a clean sheet the final against Ajax in May. According to the deal, he also has an option of spending another season with the Premier League club after 2021.
The Portuguese has hailed the Argentina number one as a great goalkeeper and professional, on the eve of his renewal the manager said "Sergio is a great goalkeeper and professional". 'He had a good season and outstanding performances, especially in our Europa League success.
On signing the new deal Romero said: "I am delighted to have signed a new contract. Sergio deserves his contract, and for Manchester United to have Sergio and David is fantastic in such an important role". Who wouldn't want to be at the biggest club in the world? "We have great goalkeepers here and we are always learning from each other", Romero told the club's official website. After all, the South American can expect to spend a lot of time on the bench if De Gea sticks around.
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C'è chi, però, è pronto a giurare che dietro al 'mal di denti' ci possa essere la volonta dell'attaccante croato di accasarsi altrove.
And he's since racked up 28 first-team appearances, including 12 starts as Jose Mourinho's men won the Europa League last season. It was a key audition for a player whose value will increase if De Gea leaves this summer.
Romero himself was thrilled to extend his stay with United for the long-term, describing them as the world's biggest club.
For the moment, at least, United can take pride from having two accomplished internationals ready and able to hold down the fort at the key spot between the sticks.