The team has simply "moved on", said Strauss, who had a frosty relationship with the fellow South Africa-born Pietersen.
"The danger at that time was that particular issue would overshadow everything that happened on the pitch over the course of the summer," Strauss said.
"What I was trying to do was provide clarity going forward so everyone knew where they stood.
"I think the team has moved on and the team is in a pretty good place. Some of those young guys have established themselves and that's what we will be focussing on taking England forward," he added.
England won the Ashes 3-2 but trail 2-0 in the five-match one-day series going into Tuesday's third ODI at Old Trafford.
(Reporting by Shravanth Vijayakumar in Bengaluru; editing by Amlan Chakraborty)
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