The Blues, who suffered a shock 2-1 home loss to the Swiss side in the reverse tie, need a draw to progress to the knockout stages of the continental showpiece.
Mourinho's men top Group E with nine points - three points richer than second-placed Schalke, four ahead of Basel and seven in front of bottom-placed FC Steaua Bucuresti with two fixtures remaining.
"They are under pressure and we are not," Mourinho said of their upcoming opponents.
"We can finish the job to qualify and Basel, even if they win tomorrow, have to play a last [game] at Gelsenkirchen [against Schalke].
"For them, the situation is difficult. This shows clearly that, after the first match, we did our job and they didn't do theirs.
"This Chelsea is better than the Chelsea that played at Stamford Bridge. Hopefully we can continue the good run we've had in the Champions League and finish the job."
In team news, striker Fernando Torres is available after recovering from injury, but defender David Luiz misses out with a knee problem.
Mourinho also hinted that playmaker Juan Mata will get game-time.