The defender wants his side to show that they are capable of mixing it up with the best in Europe...
The German side were hammered by their Spanish opponents in the first-leg of their Champions League tie and now need four goals to take the game to extra-time.
Whilst that seems highly unlikely with the way that the match in Spain panned out, Lahm wants his side to show that they are worthy adversaries.
"[The main objective] is to play a good game to show that we are a team capable and at the right level to play against the best in Europe," he is reported as saying by AS.
The German was absent from the first match due to injury and whilst he is set to play this time around, he admitted that "we are realists, it is very difficult to make the next round".
However, he went on to state that they will be trying to "correct the disaster" of the first leg and praised Barcelona, saying that the "four goals was a very painful loss for the whole club".
"They have a phenomenal team, it will be an honour to face them. Barca are not a group of individuals, they are a team. Each one forms part of the team and then contributes themselves. If [Lionel] Messi plays I will be glad to find myself against him," he concluded.
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James Walker-Roberts, Goal.com