The players were fined Thursday for an altercation late in New York's 45-12 victory at Washington. Haynesworth struck Jacobs after a play ended and Jacobs struck back.
Redskins cornerback DeAngelo Hall also was involved, but was not fined.
"I guess they did it, but that was expected," Jacobs said of the fines.
The league also fined Minnesota Vikings defensive tackle Kevin Williams $5,000 on Thursday for a tackle at the knees on Carolina Panthers quarterback Matt Moore.
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