'It is going to be a very hard game going away to Barcelona, probably one of the most in-form teams in Europe right now.
"The Liverpool performance was good at the Emirates and they will need that sort of performance again and Tottenham not to be on song".
"I expect that they are going to play with all the best players, but I don't know how they are going to prepare the side", he added.
Arnautovic has scored five goals and made one assist in 11 Premier League games so far this season. That, of course, would mean Spurs must beat Barcelona at the Nou Camp to progress.
Jan Vertonghen, who played his first match for nearly two months against Inter after recovering from a hamstring injury is looking forward to the game.
"What Barcelona do is not in our hands".
'It is going to be a real challenge, but we showed in parts against Barcelona at home that we can match them and be just as good as them.
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"It's going to be very competitive but of course they're qualified in first with 13 points".
Pochettino's relief was clear as he looked to the heavens and pumped his fists, but Tottenham still have one last daunting hurdle to overcome in Barcelona before they can celebrate a last 16 berth.
When Emery arrived as manager in 2016, the pair seemed to hit it off with only club legend Edinson Cavani scoring more than the 19 goals Moura managed in 48 appearances, on top of 10 assists.
Harry Winks believes Sunday's north London derby has come at a "perfect" time for Tottenham. "It is about what we do", he said. Maybe we need to change to rolling subs, like basketball, so you can go in and out.
"I think we can beat everyone if we're on it". At the start we were winning games but maybe not with our best form.
Three other players who will be missing when Pochettino names his XI for the match are Mousa Dembele and Victor Wanyama, who are absent through injury, and Georges-Kevin Nkoudou who is another who was not named in the set up for this tournament. "The most important thing is to try to avoid risk, mix the team with different players and rotate so all players feel important".