Mohamed Salah signed for Liverpool on 21 June 2017, and his contract officially began on 1 July 2017.

Quick context

  • Liverpool announced the transfer from Roma on 21 June 2017.
  • Several reports noted the deal was completed after a medical, with the registration starting on 1 July 2017.
  • The Premier League also marked 22 June 2017 as the day Salah joined Liverpool.

In short

If you mean the date the transfer was announced, it was 21 June 2017.

If you mean when he officially became a Liverpool player, it was 1 July 2017.