The highly-rated 21-year old New Zealand international had a poor debut season with the Victory last term after joining from Wellington Phoenix but is back showing the form that led to him being one of the best youngsters in the A-League.
Teammate Leijer feels that new Victory head coach Ange Postecoglou has placed plenty of faith in rojas and that has helped the young gun respond.
"Just having that little bit of extra guidance and probably the belief put in him - Ange has shown a lot of belief in Marco - and he's responded to that," Leijer said.
"He's willing to learn and he really wants to learn. With Ange, he's got somebody who's giving him a lot of direction and positive direction and Marco's responding in the way he's going about his football.
"Last year I thought maybe he was the type of player that you need to put your arm around. I think he's maturing quite quickly and I don't think that's what he needs.
"I think he just needs that someone to believe in him and Ange is really believing in him and now he's believing in himself.
"There's no limit in how good he can be. He's such a wonderful talent and if he keeps improving the way he has the first nine rounds of this season, he can achieve whatever he wants in football."