Sunday's victory coupled with other results at the weekend saw the Biancoceleste move just a point behind Udinese at the top of Serie A.
However, despite their fine form this season, Reja does not want to set any targets until Lazio reach the second half of the season.
"The Italian league is difficult and we also started last year very well," Reja told Sky.
"We'll work, wait for the end of the first half of the season to understand what we can do, but without setting any goals."
Reja did however praise his men for the effort they put in against Bologna, claiming every player did what was expected of them on Sunday.
"Today [Sunday], there wasn't one player who played insufficiently.
"[Senad] Lulic had a great game, [Djibril] Cisse is growing with every performance.
"From a psychological point of view, he [Cisse] has foudn the right spirit."
Lazio entertain Catania on Wednesday evening knowing a win could see them climb to the Serie A summit should Udinese slip up against Napoli.