"When you are captain of a club that is struggling and has just sacked their coach it becomes a difficult time and I think that has been reflective of his play," Jones told reporters.
"But the very good players compartmentalise things and he's done that terrifically well. He's led with effervescence here and trained well … he's been good."
"As long as Dylan's attitude and his body are right, he brings something to the table we need and that is strong leadership."
Hartley still has an opportunity to improve his club displays this month under interim boss Alan Gaffney, who replaced Jim Mallinder at Northampton.
Saracens number eight Billy Vunipola, who is recovering from a knee injury, will also need to prove his fitness ahead of England's Six Nations opener in Italy on Feb. 4.
"It is just a matter of him (Vunipola) being ready for Test rugby," Jones added. "I gambled with him against Ireland last year and it was a bad gamble.
"He wasn't ready so I am a bit more cautious about putting him in at the right time and allowing him to find his feet. We are desperate to beat Italy but there are longer-term goals."
(Reporting by Hardik Vyas in Bengaluru; editing by Amlan Chakraborty)
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