Boss Poch is confident his side can get a “special” result in feared Nou Camp and reach the Champions League last 16.
Tottenham need only match Inter Milan’s result at home to PSV to pip the Italians.
And Pochettino said: “It’s going to special if we qualify. It’s a must-win game but I’m so optimistic.
“How we approach the game so important.
"We must think only about doing the job we want to do.”
Reaching the last 16 would be an astonishing feat after Spurs’ stumbles in their first three Pool B games.
They mustered just one point out of nine and took tons of flak for being the only Premier League club NOT to sign a player during the summer
But back-to-back home wins over PSV and Inter have given Spurs a chance of sneaking through as runners-up to Barca.
Poch added: “We are the only team in Europe that has not signed anybody. But we have not sold anybody, either, and we have still improved.”
Rookie Kyle Walker-Peters plays at right-back with Serge Aurier and Kieran Trippier crocked.
Walker-Peters, 21, has not started a Premier League game, but Pochettino said: “I want to remind you he won the Under-20 World Cup in Korea and his quality is unbelievable.
“We don’t have any doubts about Kyle.
"He has the quality, he just needs to feel free."
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