Wilson (back) was activated from the 60-day injured list and designated for assignment by the Rays on Thursday, per the MLB.com transaction log.
The Royals transferred Avila (elbow) to the 60-day injured list Thursday.
The Royals claimed Little off waivers from the Cubs on Thursday and optioned him to Triple-A Omaha.
The Royals outrighted Velazquez to Triple-A Omaha on Wednesday.
Caminero went 1-for-3 with a solo home run in Wednesday's 4-0 win over Colorado.
Cruz secured the save Wednesday against the Twins, throwing a clean ninth inning. He struck out one.
Cameron (6-8) notched the win Wednesday against Minnesota, allowing one run on two hits and one walk in eight innings. He struck out nine.
Martinez (11-3) earned the win Wednesday over the Rockies, allowing six hits over 5.2 scoreless innings. He struck out four.
Tolbert is out of the lineup for Wednesday's game against the Twins.
Rave will start in right field and bat eighth in Wednesday's game against the Twins.
