I feel like people are looking down their noses at Dier. Probably because he doesn't have a fancy name but he is one of the best midfielders in the Prem. He played very well in a very good Spurs side and he's still 23. I'd like to see all those being so snobby about him name players who are considerably better at his age playing the same position (I'm not saying none exist, but if he's that bad there should be PLENTY of much better players out there). Let's not forget he is Prem proven too. Imagine a lot of the names will be Football Manager type players who are unlikely to succeed in Prem.
Dier actually came through the youth system at Sporting, a fact many are unaware of. How Poch identfied him was nothing short of genius. No one else saw him coming.
Half the issue with those who don't want Dier see him as a center-back, which in my opinion is a false assessment. His best season for Spurs came during Leicester's triumph, where he was deployed as a defenisve mid for the majority of it. He was so good in the role that he earned a call-up to the England squad and was largely one of our best players in the lead up to the Euros. Of course the only game people remember is the France game where he was outplayed by Pogba. Is it really a surprise, or even a slight on Dier, that one of the worlds best midfielders outplayed him?
last season he was shifted to CB after Alderweireld (think it was him) got injured, allowing Wanyama to take his place at DM. He was so solid at CB, Poch decided to switch to a back 3 after Alderweireld returned from injury. All season long Spurs seamlessly switched formations (during the game at times) and this was entirely down to Dier's versatile skillset.
People try to claim that Dier was moved to CB to accomodate for Wanyama, which is not true, he was simply sacrificed for the betterment of the team. Similar to how Rooney was often sacrificed to the left flank for the same reasons. The lad hasn't whined about it once as far as I can recall, but I'm sure if you asked him which role he favoured most he'd say DM.
There is a good reason that Spurs fans don't want to lose him. His contribution to the team is difficult to spot for an outsider unaccustomed to watching Spurs, but nontheless significant in every way. Jose can see the potential in him, glad he is running our club.