Not worried about Diaz, I think we'd be happy to face a player who hasn't played in months.
Thiago is more of a concern even with his recent layoff. He approaches the game with the class and approach that lets him seamlessly come back after a layoff. As Kingsland called out - he tore us apart earlier this year, and I too am worried about Nunez vs Holding, doubly so if Thiago is there to play him in.