What happens to Optimus Primes arm after Transformers 3?

What happens to Optimus Primes arm after Transformers 3. In the end of Transformers 3, Optimus Prime's arm is chopped off. Are we to assume that he will get it fixed or since he is a robotic alien he would not be able to. I was just wondering because if they make a Transformers 4, it would be weird to see Optimus fight with only one arm.|||Well, considering Ultra Magnus got completely discombobulated in Transformers: The Movie and the junkions were about to slap him back together with a little alien superglue, I think Optimus will be alright.|||prime will be fine cuz u know how bumble bee lost his legs in the first movie somehow he got them back otherwise he wouldn't be able to transformer so that megon fox and shia lebouf (or however u spell his last name) make out on his hood plus ratchet is still around and i bet he can fix him

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