Mortimer was born in
Liverpool. He began his career with
Coventry City, where he came through the ranks to make more than 200 first-team appearances as a midfielder. His displays for Coventry attracted the attention of several top clubs, and he joined
Aston Villa for £175,000 on Christmas Eve 1975. Mortimer captained Villa to the
1980–81 Football League championship, the club's first League title for more than 70 years. After the game, he swapped shirts with an unknown Bayern player, and has since tried and failed to recover it. From 1975 to 1985 he made 406 appearances for Villa scoring 36 goals. thereby breaking the second-city taboo by playing for City and Villa. Mortimer was capped by England at youth and
under-23 level and captained
England B, but was never capped for the full England team. ==Post-playing career==