Joe Lewis has warned Charlton that Peterborough are out for revenge when the sides meet at The Valley this weekend.
The Addicks inflicted a 5-1 home defeat on Posh at London Road in November but Lewis is confident of a different outcome under Darren Ferguson this time around.
Goalkeeper Lewis said: "We owe Charlton one for what they did at our place.
"They are a good team with some great individual players, but we will be going there high on confidence and in good spirits.
"The team spirit here played a big part in us getting back-to-back promotions under Darren Ferguson and it's starting to feel like that around the place again.
"We've just had a couple of performances which we can take a lot of positives from. Coming back to beat Sheffield Wednesday and then fighting back to draw with Southampton like we did proved what we can do."