The trio will rejoin the Magpies' under-23s group for the remainder of the season.

Sørensen, 19, scored 19 goals for United's second-string before heading to Bloomfield Road in January while 21-year-old Roberts scored 13 times and claimed several assists ahead of his move to the JobServe Community Stadium. He also scored for Newcastle's first team against Blackburn in the Emirates FA Cup.

Right-back Sterry, 23, has made three first team appearances under Rafa Benítez this term and had rejoined Crewe for a second spell after spending part of last season at Gresty Road.

All three could play for Ben Dawson's under-23s at Reading in the Premier League Cup on Friday.