Newcastle's Jacob Murphy, Fulham's Stefan Johansen and Swanea's Jefferson Montero all joined the Baggies on loan on the final day of the January transfer window.
The trio all signed deals to stay with the Baggies until the end of the campaign and fill the void left by the departure of Harvey Barnes and Bakary Sako.
“All three will give the team different dimensions,” Darren Moore told the club's official website. “All three have excellent experience and a real know-how of the division. They are good players with individual skill sets which will benefit the team.
“All are wonderful characters which everyone knows is so important to us. They will add more competition to the team and add to our depth and numbers at a crucial time.
“You only have to take one look at the fixture list over the next couple of months to see we have some great games coming up. I’ve tried to utilise the loan market as much as I can and maximise everything I am able to to help the squad.
“These players will do that.”
Meanwhile, youngsters Jack Fitzwater, Kyle Howkins and Alex Bradley all departed on loan.
Fitzwater has joined nearby Walsall; Howkins returns to Port Vale and Bradley has ended his spell at non-league Havant & Waterlooville to join Burton Albion.
The trio will stay with their respective clubs until the end of the current campaign.