Originally published on ProWrestlingSheet.

Pro Wrestling Sheet has learned it's only a matter of time before we see Nikki Bella back in a WWE ring ... because doctors have officially cleared her for a return.

As we previously reported, Nikki started training again last month and was waiting to get the green light from WWE's medical staff. We're told that's finally happened.

No word yet as to when she'll return, or on what brand.

We broke the story back in March ... which stated The Fearless One could only come back on a part-time basis if her surgery was a success. Our sources say that's still the case, and she's been instructed by WWE officials to take things slow upon her return.

Rejoice, for the Queen will soon be back.