Clarke was speaking before his departure for the Caribbean where Australia play two Tests against the West Indies en route to England for the five-Test Ashes series, starting in Cardiff on July 8.
Pietersen, 34, England's leading all-time run-scorer across all formats, was told by new England director of cricket Andrew Strauss last week that he was "not part of our plans for the summer", saying there was a "massive trust issue" between the England and Wales Cricket Board and the controversial batsman.
"There's probably two sides for me," Clarke told reporters.
"There's the personal side where I feel for KP because I get on well with him and I'd love to see him back playing cricket for England.
"His form has been outstanding, he's still a great player and I know he wants to play, so I feel for him on that side.
"The other side (is) we go there soon to play against England.
"Any team without Kevin Pietersen in it I don't think is as strong.
"His statistics speak for themselves.
Clarke's views follow those of Australia teammates Ryan Harris and Peter Siddle, who last week voiced their relief that Pietersen will not be playing for England as the Australians bid to end a 14-year Test series drought in the United Kingdom.
Irrespective of the situation with Pietersen, Clarke said he expects Australia will face a difficult England side playing on their home pitches.
"Playing away from home is your greatest challenge as an international sporting team and England will be tough," Clarke said.
"As are West Indies, and it's really important we stay focused this West Indies tour and have some success there."
Australia's first Test against West Indies begins in Dominica on June 3 followed a week later by a second Test in Kingston.
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