Bolton boss Sammy Lee has completed his first signing since taking charge by turning striker Zoltan Harsanyi's loan into a permanent deal.
Lee took over from Sam Allardyce with two games of the season left
The Slovakia Under-21 international arrived at the club in January and has penned a three-year contract.
Harsanyi, 19, has scored three times in seven games for the reserves.
"My personal objective for next season is that I would like to get into the starting line-up of the first-team," he told the Bolton website.
Harsanyi also aims to play a part in Bolton's campaign in the Uefa Cup.
He arrived at the Reebok stadium from FC Senec with compatriot defender Lubomir Michalik, who broke into the Bolton first-team towards the end of the season.