"Fyvie is good enough to play at the highest level in England. He has the potential to play for the top clubs," said Brown in the Daily Record.
"The talk of him going to Fulham has been going around for a while, but I reckon he could do a lot better.
"We are disappointed he has chosen not to accept the new contract offered by Aberdeen.
"He would have benefitted from continuing his development at Pittodrie. But it's a free world and he now has to look to do the best he can as far as moving to his next club goes."