"The ball got away from me, and now I['ve] got to pay for it," said Riske, who was also fined $1,500.
Indians manager Eric Wedge and bench coach Robby Thompson each received an automatic one-game suspension. Wedge served his suspension on Friday night, and Thompson will follow on Saturday.
Hasegawa, who instigated the series of events, received a fine, but not a suspension.
"I'm very surprised [Hasegawa] didn't get suspended because I think [what he did] was obvious to everybody," Wedge said. "I don't think it's fair our guys got suspended and he didn't."
Millwood, fined $1,000, echoed his manager's statements.
"[Hasegawa's] the one that started the whole mess," Millwood said. "If he doesn't get suspended, then it's pretty much a joke."
Millwood, who will make his next start on Thursday in Kansas City, gleaned a message from the discipline dispensed after Cleveland's 10-5 victory.
"I guess it's OK to throw right in the middle of somebody's back when you're getting your [backside] whooped," Millwood said. "But it's not OK to [stick] up for your teammate."
No worries: Standing casually in front of his locker, Sizemore registered little reaction when informed of the suspensions on Friday. Sizemore described the incident as "just part of the game" and declined to say whether Hasegawa should have to sit out a few games.
"That's not my call," Sizemore said.
Roster move: The Indians placed reliever Arthur Rhodes on the bereavement list and recalled pitcher Fernando Cabrera from Triple-A Buffalo on Friday. Rhodes did not travel to Detroit, but remained in Cleveland to attend to a family illness.
Wedge indicated that a player must stay on the bereavement list for a minimum of three days. He said he thought the list includes a seven-day limit.
Cabrera has made five appearances out of the Indians bullpen this season, allowing two earned runs in 9 1/3 innings for an ERA of 1.93.
Hafner's progress: Wedge was encouraged by Travis Hafner's return from the disabled list on Thursday, when the designated hitter went 2-for-4 with an RBI against the Yankees. Hafner suffered a concussion on July 16 when a pitch from Chicago's Mark Buerhle hit him in the face.
"I felt like his at-bats were pretty good," Wedge said. "Most importantly, he felt fine after the game."
On deck: Jake Westbrook (9-12, 4.55 ERA) will look for his 10th win of the year as he battles Detroit's Jeremy Bonderman (13-7, 4.03 ERA) on Saturday at 7:05 p.m. ET at Comerica Park.