The American says they'll happily survive without Pienaar, who appears on his way to Tottenham.
Howard said: "Steven has been our engine for the last couple of years.
"There is no hiding from that. He has been our star player.
"But my feeling, having been at this club for so long, is that we just get on with it. We don't dwell on things. The gaffer David Moyes is really shrewd.
"He found Mikel Arteta, Tim Cahill and Steven Pienaar.
"There will be another. That's just the way it is here at Everton."