Sphinx Boss Paul Charnley moved for the duo to ease his defensive problems due to the suspension of stalwart Terry Ward and injuries to youngsters Liam Kay and Jamie McAteer.
Conway has joined from Highgate United whilst Greatex has signed from Daventry Town and is expected to make his debut against Barwell in the home Midland Alliance fixture tomorrow.
Sphinx's Midland Alliance League Cup tie against Alvechurch which was postponed on Tuesday night will now take place at Sphinx Drive on Tuesday March 3rd. Kick off will be at 7.45pm.