The Leeds United midfielder can't speak highly enough about his Southampton counterpart.
The Southampton midfielder has established himself as a vital figure for both club and country, helping his nation reach Euro 2016 - their first European Championships - and also looked in fine form for the Saints last season, scoring five times in the Premier League.
Northern Ireland, who have won one and lost one in Euro 2016 thus far, come up against star-studded world champions Germany on Tuesday.
But although Michael O'Neill does not boast a deluge of big names, the Leeds midfielder says they are not short on big players and they don't come much better than Davis, says Dallas.
"'Davo' is quality and without doubt one of the best players in the Premier League," the 25-year-old Leeds winger said via The Belfast Telegraph.
"As Michael said, he only gets seconds on Match of the Day. I have always said that he doesn't get the credit he deserves.
"In my opinion he would get into any side in the Premier League, any side, and to be playing alongside someone like him is unbelievable and it's unbelievable for us. It helps us so much and I can't speak highly enough of him."
Davis established himself under Ronald Koeman as a key player last term, but the former Rangers man will have to prove himself all over again when the Saints return for pre-season.
The South-Coast club will be getting a new manager in the coming weeks after Koeman left for Everton this week.