Blake is confident there'll be no stopping the 22-year-old Scot as the Clarets own debut Premier League season progresses.
"Fletch has been phenomenal for the last five or six games; he's been tremendous," Blake enthused. "He just needs to keep doing that and scoring the goals and he's going to be vital for us.
"He's really, really impressed me. He's still young as well.
"You've got to remember it's only his first season in this league and a lot of the time he's playing up front on his own, so he's done tremendously well for us and has been a big asset for us this season.
"I don't want to set him any targets but he can certainly make the big 'two oh' as well, as they say, and move on from there.
"We're just pleased that he's with us at the moment and he's banging the goals in for us."