The Portuguese side take a slender one-goal lead into the second leg after Freddy Guarin's strike earned them an impressive victory in Russia.
Villas-Boas knows, though, that the tie remains very much alive, with CSKA unbeaten in the competition until last week.
He told a press conference: "This is a dangerous game. If CSKA score it will create anxiety among the players, so we have to maintain concentration.
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FC Porto vs CSKA Moscow Live Streaming
Europa League
20:05 GMT, March 17, 2011
Estadio do Dragao, Portugal
2nd Leg: 1 - 0 (Agg)
