Manchester United boss Erik ten Hag hailed the performance of Casemiro in victory over Chelsea.
Casemiro struck in the 4-1 win on Thursday night, just as he did against Bournemouth on the weekend.
Ten Hag said, "He's a massive player. Such a good signing.
"He adapted so well to Premier League football. He missed many games and we noticed that. When he's not there our game is different. You see how important he is in everything. This week twice he's scored. The first goal is always the most important of the game.
"He's doing a massive job and we're really happy."