"I would never underestimate his ability to turn things around, very, very quickly. He's been around for a long time, and knows how to reinvent himself and tweak things within a team," World Cup winner Eales told BBC Radio 5 live.
England's slump has came as a shock after an fine run since Jones' appointment in 2015, which included 18 consecutive test wins and two Six Nations titles.
"He demands high standards, so I can imagine the intensity of that environment will be difficult to maintain over a long, sustainable period of time," Eales added.
"But there is no question England will improve. Anyone who takes England lightly is a fool. They have a lot of talent in the team and a bright guy in charge."
England take on South Africa, New Zealand, Japan and Australia at Twickenham in November.
(Reporting by Shrivathsa Sridhar in Bengaluru; editing by Amlan Chakraborty)
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