Sunderland signed three new players in the final days of the winter transfer window, though fans have only seen one of them in action so far. Sunderland looked like they were going to endure a very quiet January transfer window. But in the end, the Black Cats pulled off some decent signings. Michael Beale‘s side managed to bring in Leo Hjelde, Callum Styles, and Romaine Mundle in the final days of the window, with Hjelde starting against Middlesbrough last weekend and finishing the game. He looks like a strong signing and so too does Styles who joins on an initial loan deal from Barnsley. Few …