The phrase "directly related to" is correct and can be used in written English. Example Sentence: His experience in the field is directly related to the successful completion of the project.
* = Directly related to the recurrence of ALL.
It's also directly related to stress.
"This is directly related to Sept. 11," Mr. Spano said.
"But it's not directly related to what happened".
As if one wasn't directly related to the other.
The second reason is directly related to the first.
Others underwrite only classes directly related to the job.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union