Eddie Howe wants two new centre-backs in through the St James’ Park door before the transfer window slams shut at the end of the month.
Newcastle have already had to abandon a swoop for Lille’s Sven Botman, but they are still chasing Carlos despite Sevilla rejecting a bid for his services.
It is suggested they are pushing for the deal to sign Carlos, though they have not managed to agree a fee with Sevilla yet.
The north east side have just landed Chris Wood to reinforce their attacking options, but defence is a priority.
Newcastle have leaked goals with alarming regularity and Howe wants to tighten his backline.
Sevilla are in the middle of a title race in La Liga and it is unclear just how much money will be needed for Newcastle to have a bid accepted.
Newcastle have not lost hope of having a new centre-back signed in time for the Watford game, but the clock is ticking and odds appear against them.