The Andalusian side's supremo will have to spend several years behind bars after being found guilty of fraud, corruption and embezzlement during his time as a lawyer
The offences took place between 1999 and 2003 when Del Nido worked as lawyer for the municipality of Marbella.
The prosecutor had demanded 30 years in prison for Del Nido, but the court decided to settle for seven-and-a-half years.
Del Nido took charge at Sevilla in 2002 and has since won two Uefa Cups, the Uefa Supercup, two Copa del Rey and the Spanish Supercopa.
The court of Malaga has also sentenced former Marbella mayor Julian Munoz to seven-and-a-half years in prison for the same offences, while former advisor Juan Antonio Roca was sentenced to four years behind bars.