The 26-year-old Spaniard midfielder say his side can expect a difficult match in the Champions League as the Blaugrana have some of the finest talent on the planet on their books
The Russian team were beaten 3-2 at Camp Nou earlier in this season's Champions League campaign, and will be gunning for revenge when both sides meet again this week.
And with their chances of qualification from Group G fading, the Spanish player believes Spartak must be on top form if they are to defeat the Blauranga.
"Barcelona have not really changed much since Tito Vilanova has taken over. They still have the best players in the world and it will be very difficult to beat them," he was quoted as saying by EFE.
"We will obviously try to beat them, but it will be very tough," he added. "They are one of the best teams in the world and play some great football.
"We have some great players as well, though, and we have been in fine form in the league."
Tuesday's encounter is scheduled to kick off at 17:00 GMT.