Against Brisbane, his arrival on the park late in the first half sparked the Warriors attack, with a sweetly delivered ball putting Ben Henry away for their first try. He went on to make 103 metres from 13 runs and made 18 tackles in an energetic and productive 35-minute spell.
Mateo will again start from the bench against Penrith, and while he is wanting to play more minutes, he says he is happy as long as he is making a contribution.
"It doesn't matter to me. At the moment, the way things are going, our forwards that start really get us going forward really well.
"We were a bit down on the weekend but recently the boys have been going really well," he said. "When I come on hopefully I can just take advantage of those inroads that the boys make and play a bit of footy."
After starting his NRL career with Parramatta in 2004, Mateo has learned to ignore any media hype, positive or otherwise, and says his focus is fixed on what his coach and teammates are striving to achieve.
"It's cliche but you don't listen to the media. It's easy to fall into the trap of listening to what gets written about you and what gets said about you but I think to be a professional in this job you have to listen to the people that matter, and that's your coach and teammates," Mateo said.
"In order for me to play good footy I just have to focus on what I can do better and not worry about the outside noise."