Jovetic shone in their FA Cup win over Chelsea.
"Stevan Jovetic played well [against Chelsea]," Weaver told talkSPORT. "We didn't sign anyone in January but he had a slow start to his Man City career with injuries and stuff so he is like a new signing for us.
"It gives Manuel Pellegrini another option as he's got four world-class strikers now who are all a little bit different. If he plays with two upfront he has another two on the bench. There are a lot of options there."