Giroud as hit five goals in two games.
“I don't think Chelsea can afford to let Giroud go," Hasselbaink said on Premier League TV.
"Even if he isn't number one, he can come off the bench and make something different.
“I know he is going to want to leave, but I think Frank (Lampard) has to be very selfish there and say no.
“Maybe he can call (Didier) Deschamps and have that conversation with him and ask, 'what does he need to do to be in your team and how much does he need to play?'
“Frank has to be a little creative to keep him because he is important for the team."