It's a tricky situation in all honesty.
Yes he has a great amount of potential, we have clearly offered him a deal, from what I have heard we have improved the offer based on his continued involvement in the first 11. He knows whats on the table, his agent will obviously be talking to other interested parties to see what other deals he can get Rekeem, at this point no doubt he will try to force the club into offering a little more.
As a club we have to look at this as a business, yes he does have potential, but he has been involved with the first team squad for as long as Field, granted he has started more but you could argue Sam has had more input on games (goals, assists etc) from memory I don't think Harper has contributed any assists?
We have obviously offered him a deal, I would imagine of around 3/4 years with an option, on around 10k a week. Should we be bending over and giving him more? I'm not so sure.
If he believes the grass is greener elsewhere then so be it, he only has to look at Berahino, Izzy Brown, Yan Dhanda, Jerome Sinclair to know it doesn't always work out.