The Spaniard netted only his second goal of the season last weekend to secure a win over Queen of the South in the William Hill Scottish Cup.
He has now set his sights on adding to that tally and admits a goal against the Scottish champions would be "spectacular". But, having claimed maximum points against Celtic already this season, Borja would be satisfied simply to record another win.
He said: "I have played eight or nine games now so I have more confidence in myself. The last goal has given me more confidence and, if I play, I'm hoping for a good game on Saturday.
"It would definitely be spectacular to score against Celtic. I want my team to win and, if I score, that's even better. If I don't score, I'll still be happy for my team if they win."
The former Real Madrid youth player arrived at Rugby Park in the summer, having spent his entire career until then in his native Spain.
The 30-year-old added: "I think I needed time to get used to Scottish football and the style of life. I can say I'm settled into this life now. I'm ready now to do my best and to play better."
Celtic sealed their progression to the last 16 of the Champions League thanks to a dramatic victory over Spartak Moscow on Wednesday night.
And Borja believes the Hoops' European success can only help boost the image of Scottish football around the world. He said: "The Champions League is the best tournament in Europe, possibly the world.
"I'm impressed that Celtic are in the next stage of the Champions League. It's good for the Scottish league because the world now looks at this league better than before."