Michael Carrick admitted Manchester United had to “dig deep at times” to earn a Premier League draw against Sunderland. A goalless stalemate on Wearside saw the Black Cats enjoy the best of the opportunities throughout, going close through Chemsdine Talbi and Noah Sadiki early in the first half. After the break, United goalkeeper Senne Lammens was called into action to deny Brian Brobbey and the striker shortly turned provider for Lutsharel Geertruida, who hit the post. Joshua Zirkzee had nodded over for the visitors in the first half, while a late surge at the death saw efforts from Matheus Cunha and Bryan Mbuemo blocked. United sealed Champions League qualification with victory over Liverpool last weekend and Carrick was focused on the positives after sealing a point. He said: “It was a tough game. Credit to Sunderland, I think we knew it was going to be a tough game.…