Hold the phones on Jason Terry heading to the Boston Celtics. ESPN's Marc Stein is reporting that Terry will give the Dallas Mavericks a chance to "counter" the Celtics' offer before he makes a final decision.

Yahoo! Sports' Marc Spears is reporting that Terry was "closing in" on a three-year contract with the Celtics for the mid-level exception, which would be just under $16 million. The Mavericks can offer Terry more because they have Larry Bird rights on him. It appears that Terry will give the Mavericks a chance to offer him more money if they so choose. Now, it's up to Dallas to figure out if it's worth paying the 35-year old to stay with the franchise for longer than three years for just under $16 million.

The Celtics originally wanted to pursue O.J. Mayo, according to HoopsWorld's Alex Kennedy, but he asked for more money than the Celtics were willing to give.

For more on the Celtics, visit Celtics Blog and SB Nation Boston. For more on the Mavericks, visit Mavs Moneyball and SB Nation Dallas.