The Three Lions produced a superb display in Rome on Saturday night to dump out Ukraine and progress to their first Euros semi-final since 1996.
Harry Kane gave England an early lead after being played through by Raheem Sterling, and Harry Maguire’s header immediately after half-time saw Southgate’s team take control.
Kane added a third for the Three Lions soon after and Liverpool captain Jordan Henderson rounded off a superb evening with England’s third header.
The new Roma boss told talkSPORT: ‘Denmark are solid. They also found a way to play different than the way they started.
‘They started of course with Christian Eriksen as a no.10 and with a back four. They are now playing with three at the back, a solid team, good players playing in the best leagues with lots of experience.
‘They are very positive in spite of what happened to Christian and it looks that they are emotionally strong.
‘I think it is of course going to be a difficult match for England despite England playing well and being at home.’
On England’s win, Mourinho added: ‘Of course it was a good performance, they made it easy. As I was expecting when we spoke last time, it should have been an easy game for England.
‘It was always under control. No problems at all, no injuries, no suspensions and a semi-final that of course is going to be more difficult because Denmark is a much better team than Ukraine.’
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