Merson took aim at the attacking midfielder, who he felt put in a lazy" display against the Midlands team.
He felt that Havertz did not put in enough of a shift in midfield, and could have prevented Villa's first goal.
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You've got to stop that cross," he said on Sky Sports regarding Havertz not closing down Lucas Digne in the buildup.
There was a time when Ben White jumped out of a tackle before coming off.
You've got to stop these things. These chances come around not too many chances in a lifetime of winning the league and you've got to get out there and stop that.
Ben White is jumping out of a tackle, he's a defender jumping out.
You don't get these chances. You go home tonight and think that's gone. For me it's gone. You've worked that hard for 32 games to go that extra yard, just one yard to stop that cross.
It's lazy. It's 100% gone."