The Black and Whites have moved quickly to provide cover for the injured Shaun Berrigan who broke his collar bone against Leeds two weeks.
That only left Hull with one recognised hooker in bright star Danny Houghton, so McShane now provides cover and competition for the No.9 jersey.
Hull FC head coach Richard Agar said, “After a tough Easter period we have picked up some short term injuries, particularly in our pivots and have had a look at the loan market to provide us with some cover.
“I coached Paul at junior representative level and he is a talented ball player and after having a look at the players available he certainly was the pick of the bunch and fits what we were after.”
He added, “It is a time of year when a lot of clubs pick up injuries and at lot were enquiring about the availability of players, particularly Paul, but we have managed to secure his services and alongside Danny Houghton he will bolster the squad in the short term.”
McShane is a talented product of the prospering Leeds Academy set up, having been forced to wait his turn in the first-team behind the likes of academy team mates Kallum Watkins and Ben Jones-Bishop, who all made their debuts in 2008.
The 20-year-old was part of the Leeds Academy side that won the Grand Final in 2007, the year he was named Academy Player of the Year, as well as representing England at Under 18s level in Australia in 2008.
As a player, he is held in high regard at the Rhinos having been signed up to a five-year deal with the club, ensuring he remains at Headingley until at least 2013.