The injury Bullard suffered at Aston Villa on Saturday was not as serious knee ligament damage as first feared.
“Jimmy is going to be out between six and eight weeks, a totally separate injury to anything he has had before,” Brown told Sky Sports News.
“It is a grade 2 sprain on his medial ligament, it is not connected with anterior cruciate ligament.
“Whichever way you look – on the negative front we are losing a very good player for six weeks, but on the other side it could have been a lot longer.
“It has been a horrendous day [waiting], but you talk about popularity – the amount of well wishers and people asking about Jimmy, it is fantastic the response to one of the most popular players in the country.
“I am hopeful that Jimmy will be back on the field of play before the transfer window closes – that is what I am looking at and hopefully what everyone else is looking at.
“It also gives us a chance to strengthen his other leg, it hasn’t been a problem but it gives us a chance to strengthen.”
