England need to raise their intensity in training to counter the lack of testing opposition in Euro 2020 qualifying, says boss Gareth Southgate.

The Three Lions hammered Bulgaria 4-0 at Wembley on Saturday courtesy of a hat-trick from captain and Tottenham striker Harry Kane.

Under Southgate, England reached the semi-finals of both the 2018 World Cup and the summer's Nations League.

"We have not had the tight, tense matches that the Nations League provided as of yet," said Southgate.

"(Matches) that really we learnt so much more from. So therefore, we have got to do that in training and the challenge of training has got to be so high that we learn from those moments and we can see what the players are capable of."

They will take a step closer to next year's tournament with victory over Kosovo at Southampton's St Mary's on Tuesday.