Telford have been quick to sign a keeper as cover for Ryan Young, who is about to start a four-match ban.
McCarey could be in line to make his Blue Square Bet North debut for the Bucks against Harrogate on Saturday.
Young serves his ban after being sent off against Darlington in the FA Trophy for violent conduct. Another game was added onto the ban after he picked up his second red card of the season.
Meanwhile, the club have confirmed striker Steve Abbott has joined Chasetown on loan for a month.
Source: BBC Sport
Source: BBC Sport