Osvaldo reportedly slapped Lamela in the dressing room after the game, resulting in the club imposing a hefty fine and a one-match ban on the striker.
However, Lamela has now revealed that disagreement is completely behind the Giallorossi duo, although he dismissed reports that he had insulted his team-mate, resulting in Osvaldo losing his temper.
"The fight with Osvaldo is already in the past," Lamela told La Roma. "He apologised, but one thing's certain, I never said 'You're not Maradona' [to him] as the papers wrote.
Lamela has enjoyed a good start to his career at the Stadio Olimpico following his summer move from River Plate, and admits he is looking to help his team qualify for the UEFA Champions League.
"I'm a playmaker, I like to help my team-mates during matches," Lamela added. "My motto is: 'All for one and one for all'.
"I am very happy with my performance, but we have to work harder because we want to achieve important goals.
"We are far from first place, but we have to fight to finish in a Champions League spot."
Roma are currently sixth in Serie A, ten points behind joint-leaders Juventus and AC Milan.