He was a loyal servant to the club for whom he signed as an amateur, before signing as a professional in 1965. His debut was against Arsenal at Highbury in March,1969. Although the team lost 0-1, Pratt kept his place and started eight of the last ten games of the season.
For the next three seasons he made infrequent appearances although his first goal was in a 3-2 victory at Arsenal in September, 1969.
At the start of season 1972-73 following the departure of Mullery, he got his opportunity in midfield. He was part of the successful League Cup winning team that season but his appearance in the Final lasted only 20 minutes before he went off injured.
He was part of the UEFA Cup team which reached the Final in 1974 and continued to be an important member of the team until 1980.
In all he made over 300 League appearances and scored 39 goals. A fully committed Spurs player, he went to America but later returned as a coach and was Assistant manager under Peter Shreeves.