Coid will start at right back tomorrow and make his Millers debut after 14 years on the books at Bloomfield Road.
He is also free to play in the FA Cup on Wednesday night at York City.
Moore told Millersplayer: "We've made lots of phone calls trying to bring a right-back in and it's been really, really tough so we are very pleased that Holly at Blackpool has allowed him to come.
"He's a very experienced player who knows what the games about and the big thing for me is that he's fit and raring to go. The good news is that John Mullins injury is probably only going to mean he's out for a couple of weeks but Blackpool have allowed Danny to come and play and he can play in the cup for us on Wednesday. He was actually the first one we enquired about although we enquired about others afterwards.
"Danny is here for a month to start with but it can be extended and we'll see how things go and take it from there", added Ronnie.
He is also free to play in the FA Cup on Wednesday night at York City.
Moore told Millersplayer: "We've made lots of phone calls trying to bring a right-back in and it's been really, really tough so we are very pleased that Holly at Blackpool has allowed him to come.
"He's a very experienced player who knows what the games about and the big thing for me is that he's fit and raring to go. The good news is that John Mullins injury is probably only going to mean he's out for a couple of weeks but Blackpool have allowed Danny to come and play and he can play in the cup for us on Wednesday. He was actually the first one we enquired about although we enquired about others afterwards.
"Danny is here for a month to start with but it can be extended and we'll see how things go and take it from there", added Ronnie.