Arsenal need only a scoreless draw to qualify. Is there a danger they will be caught in two minds tonight?

Arsene Wenger will impress on his team the need to attack and not get caught out playing for a 0-0, which is what happened when they played Villarreal three years ago. Arsenal were almost taken to extra time by a last-minute penalty in that game, which fortunately for them was missed. I hope they have learned their lesson.

As we saw last night, no matter what the manager might say beforehand, if a side doesn't need to win, their instinct is to be cautious. That could be very dangerous for Arsenal. With their defensive problems, they are not set up to play for a goalless draw.

Arsenal will be without Manuel Almunia, William Gallas, Gaël Clichy and Johan Djourou through injury. How much of an impact will that have?

It puts pressure on the men coming into the side. Kieran Gibbs, the 19-year-old left back, will be up against Ruben Cani, one of Villarreal's better players. Gibbs played half an hour against Porto earlier this season when Arsenal lost away from home - his only appearance in Europe. There is a huge question mark over him.

Gallas's absence puts extra responsibility on Mikaël Silvestre, who has looked very vulnerable when he has played this season, which hasn't been very much because of injury. As the left-sided centre back he will need to protect Gibbs as well as concentrate on his own responsibilities, so defensively Arsenal have real cause for concern.

How far will Villarreal miss the injured Marcos Senna?

He is their key player, a defensive midfielder who not only cuts out the play but can also set it up. Brilliant in Euro 2008, he showed last week that he can score, too. Villarreal are also without Santi Cazorla, another of their key playmakers.

Arsenal are unbeaten in 23 home matches in the Champions League and 18 matches in the league. Will their confidence be a significant factor tonight?

When you have a young side, success is often down to momentum and self-belief. In contrast to last season, when Arsenal faded badly towards the end of the campaign, their confidence has been growing since the new year.

There are still question marks over their ability to keep a clean sheet but there is no doubt they can score goals. The recent return to fitness of Emmanuel Adebayor - who scored with a brilliant overhead kick in the first leg - is a huge factor. His presence means Arsenal are always capable of scoring more than once.

Robin van Persie may miss out through injury. How much of a blow is that to Arsenal?

Adebayor's return means it is less important than it might have been but Van Persie is one of Arsenal's most important players. He has scored 17 goals in all competitions this season. It would be very helpful to them if he could play some part.

Should we expect a nervy night at the Emirates or do you expect Arsenal to come through comfortably?

It could be a very anxious evening. I am not confident that Arsenal will keep a clean sheet. I think they will go through, though, maybe 2-1, having gone 2-0 ahead before conceding late on and giving their supporters a nervy last few minutes.