paris saint germain boss laurent blanc has called for calm in the anticipated cauldron of stamford bridge as his side bid to oust chelsea in wednesday night's champions league last 16 second leg on the eve of the first leg three weeks ago blanc spoke of jose mourinho being the arch provocateur and called for his players to keep their composure now the psg coach has warned of striker diego costa's combative nature and the need for his side to balance risk taking with being difficult to beat in a tie finely poised at 1 1 psg star  zlatan ibrahimovic plays a first time pass as he prepares to take on chelsea at stamford bridge  david luiz (second left) returns to his former home turf in a bid to end chelsea's champions league run  psg players are put through their paces on tuesday night ahead of wednesday night's second leg match  ibrahimovic will lead the line for psg while luiz is keen to show chelsea they were wrong to discard him  'he likes contact, and provokes opposition players that's part of his game he thrives off that,' blanc said of costa 'he really needs that to bring out the best in his performances 'the most important thing is to not get caught up in the way he plays 'he will try to provoke a reaction we need to stay calm, not get caught up in his game we need to be as effective as possible in stopping him 'it's up to us to try to take some risks, but not lose our heads and take unnecessary risks 'paris saint germain need to stand up and be counted we also need to stay in the game that's the difficulty yes, we need to attack, yes, we need to create chances, but we also need to stay solid' luiz looks to the heavens as he takes to the pitch for training on the eve of their must win encounter  laurent blanc addresses his players, including (from left) thiago silva, luiz and ibrahimovic  blanc gestures to make a point to his players on tuesday at stamford bridge  the frenchmen, eliminated on away goals at stamford bridge last term when they let a 3 1 first leg advantage slip, must score to advance to the quarter finals for a third straight season blanc avoided talk of revenge after demba ba's heroics last term   the striker's last gasp goal earned chelsea progress to the semi finals   and called for his side to take their chances the psg boss said: 'chelsea have a slight advantage, because they were able to score an away goal it's up to us to try to do what chelsea did in paris 'one of chelsea's main threats is the fact they're very good on the counter attack, so i don't think we should go gung ho 'we have to attack and we need to score a goal, regardless of whether chelsea get one or not although injuries have hampered ibrahimovic's involvement, blanc is sure he will have an impact  brazilian defender silva sports a black eye after contact with dimitar berbatov last week  'i hope we do better than chelsea did in the first leg chelsea created only one chance and they scored from that i hope we create more than one chance' blanc hopes thibaut courtois is busy, but beaten, in chelsea's goal blanc added: 'their goalkeeper's performance was what allowed them to start as slight favourites going into the second leg over the 90 minutes psg played better than chelsea 'if we create chances tomorrow night and he plays very well again that will prove that psg have once again been better than chelsea 'he was very good in the first leg and i hope he's not as good tomorrow night' luiz plays with a ball as his team mates look on with stern glares as they prepare for wednesday night  psg traverse the bridge turf under lights ahead of their bid for a champions league quarter final place  for all the millions they have spent   including paying £50m to chelsea for david luiz   psg are still to break into europe's elite blanc believes it will take time 'it's very easy to talk about, it's less easy to go out and do it,' blanc said 'in order to progress as a club you need experience paris saint germain have got a little bit more experience, but we're still a long way off having the same levels of experience as chelsea 'chelsea took a long while to become one of the best sides in europe they also invested a lot of money to get there 'we need to be patient 'in order to become one of the top four or top six sides in europe it does take time we've started that process' diego costa (left with ramires) will try to get under the skin of psg's players, says blanc  one notable difference this season over last is that zlatan ibrahimovic is available to blanc the sweden striker was injured last term, but will come up against chelsea captain john terry and either gary cahill or kurt zouma 'i don't think those two players (cahill and zouma) are going to be happy about facing zlatan,' blanc said 'he's someone who loves the big occasion he's a player who can score at any time, in any venue, against any opponent 'i hope he shows that tomorrow night'
paris chelsea wednesday stamford bridge the champions league first david luiz west london star zlatan ibrahimovic psg laurent blanc blanc
paris saint germain and chelsea meet on wednesday at stamford bridge . the sides are 1 1 after the champions league last 16 first leg in paris . david luiz returns to west london following his chelsea departure . star striker zlatan ibrahimovic is available to psg coach laurent blanc . blanc warned players not to be provoked by 'combative' diego costa 