"I think he will get better every day", he said.
"How much he wants to get involved, how often he wants to be in person there with me, these eight days that we spent together practicing... was phenomenal".
The American also suggested he was not being paid by Djokovic for his time.
'This is something I do on my own time and I do it on my own dime, ' said the former world No 1.
"I said: "Listen, maybe I can help you over the phone, I don't think you need much, but this is not possible for me with the balance of my life", said Agassi.
Djokovic will face Spanish player Albert Ramos Viñolas today in the evening in the round of 16 and it promises to be a good game.
"Of course, we both agree that I'm going to need someone also [on a] day-to-day basis that can work with him, but he's the man".
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This comes at the expense of stability, though to what extent depends on whether you're subscribed to the Fast ring or Slow ring. Worryingly, the accidental mobile build even reached retail devices outside of Microsoft's Windows Insiders testing.
On Wimbledon, Agassi added: "If he wants me there, I will come and we'll figure it out".
Djokovic, at least, did not lose his and, having regained his composure, rattled off 12 of the next 14 games to complete a 5-7, 6-3, 3-6, 6-1, 6-1 win.
"For me, it's simple". And his game is built on executing to big targets. He's a guy that throws body blow after body blow after body blow and he's just never thought a lot about the other side of the court. "It's a lot of responsibility so whatever's practical and achievable - 100% I will make the effort". We don t say he s going to be here until this time or that time. Nadal's previous best was a 6-2 6-0 6-0 victory over Juan Monaco in the fourth round in 2012.
'All in all, it was good to be a part of five setter, it will put me in a good position mentally and physically it won't affect me'.
At the end patrons were treated to the rare spectacle of Nadal abandoning his hair-tugging, ball-bouncing rituals as he served out the match like a man with his trousers on fire just as the first of the intermittent rain dumped on Court Philippe Chatrier. I said, "You think?' I respect her so much".
Becker himself had coached Djokovic for three trophy-laden years, but the duo parted ways in November after Djokovic lost his number one ranking to Andy Murray.
Before the quarter-finals Nadal will celebrate his 31st birthday on Saturday then, if all goes well, follow it with a win over his compatriot, Roberto Bautista Agut, who beat Jiri Vesely 6-3, 6-4, 6-3.