The Portuguese forward has shown his quality when coming off the bench for the Reds this season.
Jota, who was signed from Wolves in the summer, already has three goals in eight appearances. But Barnes thinks he still has plenty to learn.
"If he keeps going the way he has started the season, he will put pressure on the three starting attackers – it's a good thing to have competition for places.
"Before this season, if one of the front three was to get a long-term injury then you would start to worry as Xherdan Shaqiri and Divock Origi weren't good enough to replace them, but now with Jota coming in, I have full faith that he would come into the starting team and do equally as well as any of the current front three.
"His price tag of £45m, it doesn't make any difference, whether he is sitting on the bench or starting. People can complain about a £45m player sitting on the bench, but if you were to put him in the team and drop Mo Salah, then you have an £80m player now sitting on the bench.
"If teams want a strong squad, that is the money that you have to spend to bring them in, so for me, his price tag is completely irrelevant."