The 31-year-old Californian first joined the npower League Two club on loan last the weekend after a shoulder injury ruled out number one Ian Dunbavin for the rest of the season.
Rachubka met his new team-mates only hours before the FA Cup tie with Oxford and went on to make a string of impressive saves in the 3-3 draw.
Football League rules governing loans outside of the emergency loan window dictate deals can only be extended by seven days at a time.
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- Ian Dunbavin