Brosque, 26, who won the last of his four caps three years ago, was selected after Nagoya Grampus striker Kennedy was forced to withdraw from the squad with a back injury.
"It was totally unexpected but I can't wait to get over to Oman and join the rest of the team," Brosque told the Australian Associated Press.
"It (being selected) is something I haven't been thinking about ... I've just been trying to concentrate on playing well and consistently with Sydney FC."
Australia have struggled for goals in the competition with Everton midfielder Tim Cahill scoring their sole effort in last month's 1-0 home win against Oman in Melbourne.
In other qualifiers, three-times champions Iran should prove too strong for Group E's bottom side Jordan in Tehran, while the other group match sees former England captain Bryan Robson in charge of Thailand for their visit to Singapore.
Asian Cup holders Iraq, runners-up Saudi Arabia and third place South Korea have already qualified for the 2011 edition along with India, who booked their place courtesy of victory in last year's AFC Challenge Cup.
