Cape Town - Crystal Palace manager Alan Pardew feels Wilfried Zaha's pace will unsettle his former employers Manchester United in the FA Cup final at Wembley on Saturday.
The England international only played two games for the Red Devils under Sir Alex Ferguson, before he was loaned out to the Eagles in 2013.
His loan spell was made permanent in the summer of 2014 and Pardew believes the 23-year-old midfielder has unfinished business with his former club.
"I know that Sir Alex Ferguson still feels he should be a United player," Pardew said.
"Wilf can run fast all day, he can beat players for fun, and he has a great physique. There's a lot going on there. Probably still unfinished talent in my opinion.
"Sometimes he still wanders around in training a little bit and I have to kick him up the bum or throw something at him. But you have to understand this guy is 23 and some players take longer to progress.
"But there is no problem with Wilf now. I think his personality traits have improved around the group. And that comes from us leaning on him, both myself and some of the senior players."