Perez, who recently signed a new two-year contract with the defending champions, was sent violently into the barriers in a brutal accident that saw the Mexican, Magnussen and his Haas team-mate Nico Hulkenberg taken out of the race.
The incident summed up a dismal weekend for the American team, with both drivers having been disqualified from qualifying due to exceeding the maximum 85mm opening in the wing for DRS.
Magnussen gives firm response after Perez crash
The stewards ruled that there would be no further investigation into the crash, a huge decision that has had fans and pundits alike talking. For Magnussen, it was a big relief given his situation.
The Dane currently sits on 10 penalty points and if he had been penalised for the incident, it is likely he would have been issued a race ban.
However, speaking to media at the Canadian Grand Prix, the 31-year-old was firm with his argument that Perez was aware of where he was on track, having seen the images multiple times afterwards.
“He cannot say that he has not seen me,” said Magnussen.
“It was clear to me that he saw me, that's why I kept driving so fast. If I wasn't sure, I probably would have slowed down. That's why I trusted him to leave enough room. In retrospect, I shouldn't have done that.
“Your opinion may change from time to time, but in this case I will stand my ground.”