Successive 0-0 draws have slowed the momentum of Juve, who previously won six matches in a row - scoring 19 times in the process.
But their goalless stalemate against Atletico Madrid in the UEFA Champions League on Tuesday was crucial as it booked their place in the last 16.
Juve are the only Serie A side remaining in Europe's premier club competition and showed good character to qualify after losing two of their first three Group A matches.
"It will be tough up against Sampdoria," he told JTV.
"Then we'll see who we get in the [Champions League] draw, but we've got time on our side to prepare for whoever we're pitted against."
Juve's players are sure to be excited for Monday's Champions League draw but Allegri will insist their focus is on stopping Sinisa Mihajlovic's side.
Allegri's men have won 11 of their 14 Serie A matches this season and conceded just five goals - giving them the league's best defence.
Only Juve have shipped fewer than Sampdoria's 11, though, and they have also been beaten just once - winning six and drawing seven.
While they have been far from prolific - only two players, Manolo Gabbiadini and Eder have scored more than three goals - Sampdoria have been notoriously tough to break down.
