Tottenham full-back Kyle Walker believes Spurs' defensive unit has played a key role in the club's rise to fourth place in the Premier League this campaign.
Spurs have conceded the equal-fewest number of goals of any team in England's top flight this season and are well-poised to push for a Champions League spot.
Walker believes the solid defensive form is down to the competition for spots in the back four.
"Toby Alderweireld has been a real good signing for us. He and Jan Vertonghen play together for Belgium," Walker said at an event for marathonbet.co.uk.
"I've known Danny Rose for a while now.
"Hugo Lloris is a top goalkeeper and there is good quality competition behind us. That's not just the back four.
"I've known Tripster (Kieran Trippier) playing with England's Under-19s. He is keeping me on my toes which is good for me as he is pushing me to become a better player.
"So it's a good, strong defensive unit. It's something we've been working on in training, the sliding, keeping compact as a team and ensuring the full-backs stop the crosses.
"Its looking okay. I still think we can tweak a few improvements because nobody is perfect.
"But I still think we are going in the right direction again to becoming a strong defensive back five with the keeper. We are learning off each other."