Newcastle secured back-to-back victories in the top flight for the first time since December 2015 by winning 1-0 at Swansea on Sunday.
The victory followed up the 3-0 home defeat of West Ham before the international break and provided some much-needed cheer for manager Rafael Benitez, who missed the game after picking up an infection following hernia surgery.
Successive wins have also lifted some of the storm clouds hovering over Tyneside after the club's summer transfer dealings.
Benitez had made little attempt to disguise his frustration over the lack of squad strengthening and many observers have tipped Newcastle to make an instant return to the Championship.
"When the window is open you have to deal with those rumours," Spanish striker Perez said.
"But we know the team we have and how strong we can be.
"This dressing room is ambitious, we want to win games and that's going to be important this season.
"We have got two wins in a row and the most important thing is that we are working on what we have to do.
"We have to get the right mentality because we know the season is long and tough."