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Nielsen said Symonds has done a great job by pledging to behave "responsibly" in future but his comeback to the national team would take time.
"At the moment, Symonds' selection is something I don't want to think about it. It would only undermine the players that are there," Nielsen was quoted as saying by 'Sydney Morning Herald'.
"It's brilliant that he has got to this stage and put out a positive message, but I don't even want to start speculating about when he might return," he said.
Cricket Australia Chairman of selectors, Andrew Hilditch had also said Symonds will be monitored for a while before considering his inclusion in national squad.
"We have to see whether the all-rounder is fully committed to all of the things needed for a cricketer to be a member of the world's number one team," Hilditch had said.
Symonds, who has apologised for his "irresponsibility" and pledged a better conduct, is expected to make a comeback in competitive cricket with his grade side, the ‘Gold Coast Dolphins’, over the next fortnight.
After that he is due to feature in a few Twenty20 matches for Queensland and three Sheffield Shield and four domestic one-dayers to prove himself for a possible call-up in the home Test against New Zealand in November.