Law told the Telegraph & Argus: "It gives all of us a bit of a lift to have new players coming in and I'm sure it will boost them as well.
"They are both raring to go and this will give them the chance to play first-team football and show their clubs that they are worth a chance.
"Harpal is a naturally left-sided player, which is what we have lacked. Eddie Gray spoke very highly of what he has done at Leeds.
"We've had him watched several times in the reserves and he's going to be a big asset for us.
"Facey did well at Huddersfield. He is big and strong and will give us another option up front, especially with Ashley Ward out suspended.
"We have to look in a certain market at players who can't get in their Premiership teams. But that has worked well so far with the likes of Tom Kearney, Michael Proctor and Stephen Warnock.
"The two players have agreed it, I've agreed it and we expect to get everything sorted out tomorrow well in time for the Wimbledon game.
"We've had the same squad of players battling through this season and this will give me a couple of options. I'm sure it is going to benefit everybody with these two coming in."