Tiger Woods will be a playing captain when he leads the United States against an global team in the Presidents Cup at Royal Melbourne next month. "They will have to deal with it ... and it will be interesting how the team copes with Tiger playing".
Woods admitted it was a wrench to overlook Fowler, widely considered the best player yet to win a major championship.
Woods will announce his four captain's picks for the United States on Friday (0000 GMT).
Els said Woods had "no choice" but to pick himself after his incredible comeback from injury this year.
Woods also selected world number 14 Tony Finau, Patrick Reed and US Open victor Garry Woodland.
"It's going to be a lot of work, but something I've been looking forward to for a long time", Woods said.
The tournament will take place at Royal Melbourne from December 9 to 15.
He also threw USA captain Jim Furyk under the bus and clashed with Jordan Spieth at last year's Ryder Cup after being split up from his previously successful partnership with Spieth.More news: UPS Debuts Home Delivery of CVS Medicine by Drone
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Five of Team USA's 12 members will be making their Presidents Cup debut this year.
Woods left the door ajar on whether or not the Americans would add an additional vice-captain to Fred Couples, Steve Stricker and Zach Johnson given his own selection.
"But I just have to play one match (minimum) before singles.so it's about me getting an understanding of the guys and an understanding of the course. for all of us to see how it fits".
Woods did not say what kind of contingency plan he had if Koepka couldn't make it.
"There's always that chance, but let's just focus on coming to Royal Melbourne and this competition", he said. He said he could play more depending on what the team needs.
Tiger is the captain of the team and had to make the four final selections for the team that will face the worldwide team next month in Australia.
Hadwin knew he needed to get off to a good start this fall to get captain Els' attention and he did just that finishing runner-up at the Safeway Open in September and then following it up with a T4 in Las Vegas at the Shriners Hospitals for Children Open.