I dont think they will fire Shevchenko at all,they just signed his recently a few months back. I think they will keep him until the end of the season and maybe Genoa will in this transfer window sign some good players to actully stand a chance of not getting relegated.
Genoa has to do it if they want to stay in Serie A. 21 played only 1 win. they are very bad in defense, there have been 39 goals against them. of course a very bad achievement. I don't think it's just the defensive line that they have to improve. they also have to be strong in midfield to win the ball.
They have to overhaul all lines if they really want something good next season.
almost all of their lines have gaps and it will be very difficult for them to be able to make at least a win.
5 matches, 2 draws and 3 defeats is something quite bad for them.
they must rise from adversity if they still want to be in serie a and not be thrown into serie b.