Amos is currently behind the likes of Anders Lindegaard and David De Gea in the pecking order at Old Trafford.
“It is a decision like you would not believe,” said Amos.
“It is one of the hardest decisions I have had to make and I am still thinking about it now. I do see an opportunity there.
“If I perform to the right level, anything can happen. The manager could throw me in. At the same time, I am risking not getting the game time I desperately need. I am weighing up the options and we will see what happens.”
Amos is set for talks with United goalkeeping coach Eric Steel to sort out his future at the club.
“I am sure it will become obvious over the next couple of weeks,” he added.
“You can progress. You need that break sometimes and someone to stick with you when you have made a few mistakes.
“It’s there with David. He has played two seasons in La Liga. That kind of experience at such a young age is critical.”