"Today, close to the 50 years I will be on October 30, this is the hardest thing I've experienced," Maradona said.
"This was (like) a punch from Muhammad Ali. I have no strength for anything.
"The day I quit playing football could (have been) similar but this is much harder," Maradona said after Argentina's worst defeat at the finals since a 6-1 rout by Czechoslovakia in 1958.
"I'll have to think carefully about (the future)... I must speak to my family, the players, there's a lot (to discuss)," Maradona said.
With a hint that the future was uncertain, he said: "This wasn't the expected finale (for us), but whoever comes in must carry on on this path which is the one Argentines like.
"I thanked (the players and coaching staff) for the job they did, that's all. I didn't speak about the future," Maradona said, having emerged from a gloomy changing room.
"I could go tomorrow, but I want these kids to go on showing the real Argentine football," he said.
"I have realised as coach and player that the football the (Argentine) people like is this, searching permanently (for goals), playing, rotating. I don't think Argentina have another style.
"With the (early) lead, Germany began to get ideas that they had not had previously in this World Cup," Maradona said.
"This (loss) doesn't knock my pride in my players because I know the result is not a reflection of what happened on the pitch. They put in their chances, we also had some."
"(Messi) had a great World Cup ... (he didn't score) because the ball lifted or goalkeepers were their teams' stars.
"To see Messi weeping in the changing room, anyone who says to me he has no feelings for the (Argentina) shirt is stupid."
Germany ended Argentina's run of 10 matches unbeaten at the World Cup dating back to their 1-0 loss to England in Japan in 2002 and including the 1-1 draw with Germany in the 2006 quarter-final which they lost on penalties.
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