Son Heung-min scored in the rout but will now head off on global duty with South Korea at the Asian Cup, leaving Pochettino without one of his key performers ahead of a crucial run of fixtures.
"It took us a while, we knew it wouldn't be easy and it was about attitude and mentality", Alli said.
Mellon, a former Tranmere player who was part of the 2004 run to the last eight, took charge at the club in October 2016 with them lying ninth in the National League.
It's also worth noting that we ended the game with five Academy graduates on the pitch - debutants George Marsh and TJ Eyoma, second half substitutes, joining Harry, Oliver Skipp and Kyle Walker-Peters.
They lost in the play-off final that season, won the play-offs a year later, and are now ninth in League Two.
"Football is about interests that sometimes as a manager we can not manage". We will be disappointed with certain moments and a lot of the goals.
"I'm happy today because we keep (up) the level and we keep going in that competition which is important for the club", Pochettino said.
"As I explained for different players, it's not only in our hands, it's what the player wants". It's fantastic, a great experience for them.
"We have absolutely nothing to lose and we're excited about it".
"My ambition is to win the Champions League one day with Tottenham or the Premier League".
"They're a wonderful team, full of internationals". With two or three Carabao Cups or FA Cups. "Always you can improve, different things you can or not".