According to those dirtysheets, it appears that Sami Zayn injured himself last night on RAW.
Figure Four Weekly is reporting that Sami Zayn injured his shoulder during his entrance on Raw last night. Other sources note that Zayn was out of action during February / March because of a “minor, nagging shoulder injury”.
WWE have stated that Sami is undergoing an MRI on his upper body to determine the nature and extent of his injury suffered on Monday Night Raw. Doctors checked on him during the match but he was able to continue.