Lomax, 20, who has signed on at Spotland for a month, will go straight into the squad travelling to Barnet.
Keith Hill's preparations for Dale's first game in a fortnight haven't been helped by Simon Ramsden picking up a calf injury in training.
Rochdale already have defenders Gary Brown, Nathan Stanton and Nathan D'Laryea missing through injury.
"Kelvin is hungry and is a good player," said Hill.
"John Sheridan rates him very highly and he has given us the opportunity to bring him here to add to his experience.
"We certainly need a full back considering the fact that we have four of them in the treatment room. We have had a bit of a set-back with Nathan."
Last season: Barnet 3 Rochdale 2
Key opponent: Jason Puncheon - Youngster has been in fine goal-scoring form this season
Prediction: Barnet 1 Rochdale 1 - It should be a tight game but Dale should gain a point
Agree with the prediction? Have your say.
You can get 7/1 on Dale winning 1-0 with Betfred. For this and more odds, click here.
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