Naylor was sent off in two of his five appearances for Mansfield this term
Derby County have signed Mansfield Town defender Tom Naylor for an undisclosed fee after a loan spell.
The 20-year-old joined the Rams on loan in November and impressed enough to earn a permanent deal despite not making a first-team appearance.
Naylor has signed a contract at Pride Park until the summer of 2015.
Rams boss Nigel Clough told the
"He has settled in really well and we're pleased with the progress he has made."