"We've always maintained we're going to give everything in the competition, so you never know what can happen. It will be a very tough task."
Dier also felt it was important that young midfielder Dele Alli remained with the club, despite his 11 goals in 24 league appearances this season attracting interest from across Europe.
"He's still a very young boy, I think people need to remember that," Dier said. "I think he's at the perfect place because he's got a support system around him and a manager and a group of players that will take care of him.
"You have to worry about young players sometimes in certain places if they can cope with it and will they be looked after as a 20-year-old boy and not just an asset.
"I think he's very well looked after here and hopefully he will be for a long time."
(Reporting by Shravanth Vijayakumar in Bengaluru)
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