United had won the title the previous season, with City in third, but both clubs dropped into the Europa League from the Champions League group stage.
Everything inevitably comes to an end at some point but if an English team is to win the Champions League this season, they are likely to have to beat a team containing Messi or Ronaldo, or defeat both, in order to claim the trophy.
The other clubs to have booked their spots are European giants Juventus and Barcelona, and surprise packages Porto and Ajax - the latter of whom dethroned Real Madrid last week.
The Portuguese team reached the quarter-finals after scoring a penalty in the extra time of the second leg against Roma.
Ajax, Barcelona, Juventus and Porto complete the quarter-final line-up, and Milner hopes as many English teams as possible make the last four.
Any English club reaching this year's Champions League final will not be given enough tickets to even satisfy the demands of their season-ticket holders. "It's not sweeter for me because it's Bayern and that doesn't bring me back the better results in the games we played them and we lost", Klopp said in a press conference via LFC TV.
Ward-Prowse has one senior cap to his name after featuring regularly for the under-21s Credit PA
"It would be unbelievable for Portugal as a country, Netherlands as a country, to have a team in the semi-final".
Manchester City demolished Schalke 7-0 at home to progress 10-2 on aggregate, and Liverpool knocked out Bayern Munich after a superb 3-1 win in Germany.
"They are playing brilliantly and the results have been awesome".
But Mourinho admitted that the prospect of a Barcelona versus Juventus quarterfinal tie - and a mouthwatering match-up of Lionel Messi and Cristiano Ronaldo - would deprive the competition of what would be a special semi-final or final later down the line.
"Two great teams that are not being successful in the Champions League for a few years, of course Juventus so much more than Barcelona".
Vietnam regrets Malaysian rejection of appeal to free murder accused
It also seized a luxury yacht at the centre of a Malaysian corruption scandal off Bali island in co-operation with U.S. Federal Bureau of Investigation and returned it to Malaysia past year . "Her case is the same as Siti Aisyah's".