Barnet beat the transfer deadline to bring in 19-year-old Tottenham midfielder Stuart Lewis. Lewis joins up with goalkeeper Robert Burch, who made the loan move from Spurs to Underhill the previous day.
Lewis has captained the England under-16 side and had been at White Hart Lane for three years.
He joins an injury-hit squad so could be in line for an immediate debut for his new club in Saturday's League Two match at Torquay.