Yes, he does need a power boost. I'm not quite sure if he'll get it back though. Wasn't it one of Itachi's goals to make Oro disappear from his little bro? That'd kinda be in vain then.
Sasuke is used to the Sage's chakra even after Orochimarus seal.
We saw how Juugo recovered him during 8 tails fight.... Juugo just sent some chakra to him again, making zetsus react.