The Argentina attacker arrived in the summer from Olympique Marseille.
And Monchi says: "At a game in Milan, I fell in love. Roma had won, but Lucas had a great performance. From this game, we seriously began to follow him. When we analysed the situation, we found that we lacked physique and, in this sense, Lucas has a wonderful one.
"He stands out with goals. The 4-3-3 is perfect for him, but I think he still has some way to go. He has not reached 100% of his potential."