Juliano Belletti, who played five seasons in the Spanish Primera Liga before moving to Chelsea, believes the Blues could play in 'the best atmosphere in Spain' tonight.

The Vicente Calderon may be a stadium without roofing on three sides but that doesn't prevent the 55,000 capacity crowd generating a special amount of noise when the mood takes them, according to our experienced Brazilian.

'The supporters try to help the team for the 90 minutes,' Belletti reports. 'I have played there sometimes when if the supporters are there with the team, the game is more difficult than against most teams.'

Like many vociferous crowds however, the passion of 'Los Colchoneros' (the Mattress Makers) can work both ways. If results and performances are not good, as has been the case this season, the initial backing can turn into something very different, as Chelsea hope it will tonight if we get off to a good start.

'Of course it always depends on the team,' agrees Belletti. 'If their team fights, if their team tries to play football, the supporters are with the team, but of course if the team don't play well, there can be pressure from the fans. Maybe sometimes they don't help the team a lot.'

Belletti faced Atlético when he was with Villarreal and then with Barcelona (pictured below), but the rivalry between Barça and this team from the capital was nothing like when they took on Real Madrid, primarily because Atlético fans become temporarily Barcelona supporters in the contests between Spain's big two.

Chelsea heard the reaction former Real Madrid man Nicolas Anelka received from the Atlético fans at the Bridge a fortnight ago. Now Anelka will be aiming to make himself even less popular by breaking down a home defence now under the management of Quique Sanchez Flores.

The 44-year-old who was in change of Valencia for three games they played against Chelsea recently was appointed after our 4-0 win over Atlético a fortnight ago. A former Valencia, Real Madrid, Real Zaragoza and Spain right-back, he has a reputation for organising defences well.

'He has done some amazing jobs in Spain,' reckons Belletti. 'He is young but he is very smart, he knows about football, he played football. It is a good challenge for him because he has good players at Atlético Madrid and he just tries to help these players play good football.

'It depends on the opponent. If the opponent has quality, no coach in the world can do a good job, especially against Chelsea, but I think for defence they have a good manager and they can be better.'

You can follow tonight's game on Chelsea Mobile, which will carry video action of any goals. There is live radio commentary available via Chelsea TV Plus.