English Premier League Club, Manchester United have Officially announced reaching an Agreement with Real Madrid over the Signing of Defensive Midfielder, Casemiro.
Casemiro is expected to finalise a 4-Year deal and be Unveiled as a New Manchester United Player In the Coming days. The Player's Transfer Completion is subject to a Medical and a UK VISA as Stated on United's Official Website.

Real Madrid gets the Sum of €60m plus €10m in Add-ons over the signing of the Five-time Champions League Winner.

Confirming the Transfer, A statement on United's Official Page Reads:
 Manchester United is delighted to announce that the club has reached agreement with Real Madrid for the transfer of Casemiro.
The signing of Casemiro would certainly serve as a Huge Boost to the Manchester United Squad especially Considering the Fact that they've started the season Poorly and have also Faced Serious Criticisms due to the Performances of Midfield Duo, McTominay and Fred. 

United Lost Their Opening Game against Brighton 2-1 and were Also Whitwashed by Brentford in their Last Fixture where they got Beaten 4-0. 
United's Next Game is against Liverpool and there've Been a lot of speculations surrounding the Debut of Casemiro as a couple of media houses reports that the Red Devils wants the Player to make his Debut against one of their Arch Rivals.

Well, to Clear the doubt and set things straight, Casemiro won't make his Debut against Liverpool on Monday as an Excerpt from United's Official Statement on the Player's Signing States that the Player's Transfer is Subject to Medical and UK Visa Requirements.

The transfer is subject to the agreement of personal terms, UK visa requirements and a medical. - Via United's Official Website
Also Confirming that Casemiro won't be making his Debut against Liverpool on Monday, Italian Journalist, Fabrizio Romano has Made it clear that the player won't debut against Liverpool due to Medicals, Visa sorting and Contract Signing Which would take a some Time.