The 29-year-old, who played for the Millers between 2006 and 2010 and was signed at Crawley by current boss Steve Evans, was a surprise inclusion in Monday's 3-0 reserve win over Hartlepool, but assistant boss Paul Raynor has confirmed there are no plans to sign him.
"It was purely to give Pablo some game time," he said.
"We have known Pabs for a long time because of our Crawley days, he spoke to the gaffer and asked if he could have some game time and we were able to offer him that opportunity.
"We may do that again but that's as far as it goes at the moment."
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