The front rower moved from the Gold Coast Titans mid-season, after playing 22 games for the side.
“Manly have shown a bit of faith in me. This is a great opportunity,” Boyle said to Sea Eagles media.
“It is nice to have some security in terms of my football career in that I am here until the end of 2021, but I still have to return the favour and play some decent footy for Manly.”
Although he is starting to find his feet, Boyle believes there is still room for improvement.
“I need to be more aggressive with my own game. The first 20 games, I was just trying to wrap my head around playing NRL. It is so fast. Unbelievably fast. It is like playing touch at times with full contact,” he said.
“When I do get my opportunity, I need to step up more and earn some respect off the guys here.”
Boyle claims former teammates and ex-Manly players influenced his decision to move to the Northern Beaches.
“All three spoke highly of the set up at Manly and how much they were enjoying it here,” Boyle said.
The 22-year-old has only played once for Manly this season, coming off the bench for 25 minutes in a 12-10 loss to the Dragons.