Find the missing players

Time for another puzzle in which you have to identify mystery players. But you're getting the clues a different way this time. By looking at the clues in the first vertical and horizontal squares, you can find the solution. If you write the right answer, the player we're looking for will appear in the corresponding cell. You can start the game in any cell, so you can guess the Barça players in whatever order you like. Shall we begin? 😏

GRID I

GRID II

GRID III

GRID IV