The 21 year-old has already featured three times, including the 1-0 win over Morecambe on Saturday.
He said: "Rodrigo has come from an Under 23s set-up [at Newcastle] and I'm not having a go at that but the intensity of training and intensity of matches are nowhere near what is required as of today.
"He's going to take a bit of catching up but I think you saw the talent he's got. I think you can see his quality. It's just that final bit.
"He receives the ball very well and he reminds me of a player that I actually played with from Peru called Nobby Solano. He's a really cultured footballer, now it's about that last little bit.
"We have to sacrifice certain defensive stuff with him so when you play a player like that you need that assist, that goal or final product in the final third to negate the defensive stuff."
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