Why Oli McBurnie wondered what he'd let himself in for after signing for Sheffield United from Swansea City

Not particularly because of the club he had signed for, or moving back to his native Yorkshire from his adopted home of Swansea.

Instead, the wiry striker was taken aback by the intensity of United's training sessions under Chris Wilder.

A 'Terror Tuesday' session on their pre-season tour was designed to take players well out of their comfort zone in the Portuguese heat, while Wilder orders his charges to train how they play - leaving many of Jack O'Connell's teammates relieved to be on his side in small-sided games.

"The training is really tough... it's really intense," McBurnie admitted, ahead of Saturday's trip to the Emirates Stadium to face Arsenal.

"It's a lot tougher than I've experienced before in my career and it's something I had to get used to for the first couple of months. It was a really big shock to my system.

"But I'm starting to notice the rewards now. I'm starting to feel a lot stronger and fitter to play in the Premier League.

"We do weights, gym work. A lot of that. You have to. Playing in the Premier League is very different. But you can't argue with the methods. It's working for us."