Kelly admits he's been impressed by Liverpool's two new summer Spanish signings - Iago Aspas and Luis Alberto - in training.
"They are new to me but I've seen in training already what they can do," he told the Liverpool Echo.
"They have both got really quick feet and now it's just a case of them settling into English culture. I'm sure they'll be hitting the gym - that's what most foreign players seem to have to do when they come over here as the Premier League is more physical than other leagues.
"They seem like great lads and really talented players."