Mancini has lost consecutive games on Wearside.
"Always in the last minute," said Mancini. "It's better that we don't think about what happened last time.
"Both games up there we've played very well and had lots of chances to score. But we lost both because we were trying to win in the last second. We were attacking and conceded on two counter attacks.
"That is our mentality. If we can play like we did last year we have a big chance, but we know it will be a tough game."