Manchester City and Arsenal were beaten 2-0 at home in the first legs of their last-16 ties, and it is difficult to see either of them turning that deficit around against Barcelona and Bayern Munich respectively.It was a pair of penalties, and red cards, that helped kill off City and the Gunners, but they were already a distant second best in terms of passing and possession when they were reduced to 10 men. That is likely to be the same in each second leg too.So City boss Manuel Pellegrini and Arsenal counterpart Arsene Wenger not only have to win, they have to do it without having the dominance of the ball they are used to when they play in the Premier League.Best in Premier League, but not in EuropeIn both first-leg games, at Etihad Stadium and Emirates Stadium, we saw the difference between the best teams in Europe and the best in the Premier League when it comes to keeping the ball.In those categories, City and the Gunners are two of the top-ranked teams in England's top flight but, even when it was 11 v 11, they could not compete with Barca or Bayern.In the first half at Etihad Stadium, City had just 32% of possession after camping on the edge of their own box. City are used to seeing less of the ball when they play in Europe, but I still don't understand why they chose to let Barca completely dictate the play.Arsenal did at least come out and try to get at Bayern early on but they still only had 31% of the ball in the first 45 minutes.That dropped to just 12% in the second half, when the German team were completely dominant after Wojciech Szczesny was sent off.So neither City nor Arsenal saw as much of the ball as usual and, crucially, they were unable to make much use of it when they had it.That was because Barca and Bayern do not just keep the ball well, they also immediately press hard to win it back high up the pitch when they lose it.Only a handful of teams would try that against City or Arsenal in the Premier League.Southampton have done it, and Liverpool too, but most choose to retreat into their own half, like Sunderland did against City in the Capital One Cup final.When a team presses, it poses a different problem. Bayern, in particular, are effective at disrupting their opponents' rhythm, while maintaining their own passing game.That worked against City when they met in the group stage this season. Pellegrini's side managed only 79.2% passing accuracy at Etihad Stadium, and 78.4% at the Allianz Arena - their two lowest figures of the season.Bayern registered 88% in both games, although they did lose at home with a weakened team when they had already qualified.It was the same at Emirates Stadium. Arsenal's passing accuracy in the first half (before Szczesny was sent off) was just 75%, compared to 91% by Bayern.Again, this was their lowest of the season, and it dropped further - to 61% - when Bayern took total control of the game in the second half.Gunners need to go for it againArsenal went to the Allianz Arena and won last season. But they still went out.It is an even bigger ask for them to get a positive result this time but, if they are going to do it, they have to repeat the start they made to the first leg.The Gunners got in amongst Bayern, hassled them in their own half and did not let them settle on the ball. They created a series of early chances but that excellent start was wasted by Mesut Ozil's missed penalty.This time, with Jack Wilshere out injured, I would partner Mikel Arteta with Mathieu Flamini in front of the defence, bring back Olivier Giroud up front and play Santi Cazorla, Ozil and Alex Oxlade-Chamberlain behind him.But Tuesday will be more about the tempo Arsenal have to set than Wenger's team selection.I want to see an energetic performance from them, even if I cannot see them turning the tie around.Attack the only option for CityIt is win or bust for City, so what I would definitely not do is what they did in the first leg, which was sit back rather than take the game to Barca.I was at Etihad Stadium and it was a strange approach by Pellegrini. He started by shutting up shop but, when Martin Demichelis was sent off and City went 1-0 down, he tried to get the goal back.They actually went for it more in the last half-hour, when they had 10 men, and the second Barcelona goal virtually finished off City's hopes.Now they need to go for it from the start, and I think Pellegrini will play with two strikers, Sergio Aguero and Alvaro Negredo, at the Nou Camp instead of one, which is what he did in the first leg.Samir Nasri and David Silva's focus should be on hurting Barca, not tracking back. And, if Pellegrini tells Fernandinho not to go any further than the halfway line, he can try to get Yaya Toure forward more as well.The speed of City's attacks will be vital because Barca are so quick to reorganise when they lose the ball.So, however Pellegrini plays it, it should be an attacking line-up, with the full-backs looking to get up the wings to help his five offensive players.I am not saying it is going to work, because I do not believe City can go there and win, but they have to try - because if they stay deep again it will just be a slow death.(BBC)ANN.Az