Dumping Janssen for another player, said Poch, isn't as easy as it sounds.
Alli has had problems with his temperament on the pitch in the past but said that, despite that red card at Wembley, his behaviour is better this season, although he does not want to lose the edge from his game.
That was the first sending off of his career but followed a number of near misses last season, including a punch on West Brom's Claudio Yacob that resulted in a three-match retrospective ban.
"I have so many things to learn from this season", Alli said on Sunday. "But if you want to find a weakness in that back five, of which Tottenham have been rightly lauded in being so strong, it is in defending crosses".
"I felt disgusting straight after the red card against Gent but it was important I put it behind me and kept improving".
"I have calmed down a bit but I'm never going to take that out of my game".
Spurs midfielder Christian Eriksen has created the most goalscoring chances this season (78), with 10 of these assisting goals for the north London club.
Coaches and athlete off to world winter games in austria
Mulligan also practices with her local team at Swanson Park in Bellevue when Mother Nature cooperates with a heavy snowfall. She's even been working on her German to go along with her physical preparation for the games.
I wish I got to watch enough football to know the answer to this, but my advice would be to follow the Dortmund scouts about. "It's nice to have a manager behind you that trusts you and backs you as much as he does".
Mauricio Pochettino's men remain in second with the win and Vertonghen has warned Chelsea his side won't be giving up anytime soon in their quest for the Premier League title.
League leaders Chelsea won 2-1 at Stoke City on Saturday and Spurs then beat Southampton by the same scoreline a day later, with Christian Eriksen and Dele Alli on the scoresheet. "He's a different player and I thought we did really well but the second half was tough for us".
"It was very important that someone else scored, of course, and we had to keep it going".
"Our starts have definitely been important".
While Southampton were the last visiting team to win a top-flight game at the Lane - in the closing weeks of last season - they lost their own in-form forward, Manolo Gabbiadini, to injury after half an hour of this clash, having earlier fallen behind to Eriksen's fine strike.
Meanwhile, Saints manager Claude Puel felt his side should have been given a penalty by referee Andre Marriner in a game which he believes should been a draw. It was good to go 2-0 up but anything can happen at 2-0 - you're not safe - and after they got that goal it was important we saw the game out. "It was hard, Southampton were tough, we knew that and it was competitive".