The Chelsea captain was omitted from the matchday squad with a slight knock while the Spaniard has been sidelined since January 19 with a knee problem
Terry was left out of the matchday squad for Saturday's 3-0 win over the Magpies with a minor knock, while striker Torres has been absent since January 19 with a knee problem.
However, Mourinho was quick to calm any fears over the pair's long-term fitness, ensuring fans that both were likely to return within a week.
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"It's not an injury, it's almost an injury," the Portuguese told reporters when questioned on Terry.
"We had a decision to make and the player didn't play. We were aware Newcastle had bigger problems than us so we decided not to risk him and protect him.
"Hopefully, he will be ready for Tuesday [against West Brom]."
Mourinho's men travel to The Hawthorns in midweek, before returning to the Etihad Stadium for a second time in under a fortnight to face Manchester City in the FA Cup fifth round on Saturday.
And the former Real Madrid boss believes Torres will, at worst, be in contention for their cup clash.
"On Tuesday or City, by next week he'll be back," Mourinho added. "We will try for Tuesday but if not it will be next Saturday."
Mourinho also sent his players a warning over the difficulty of their task at West Brom, citing the short turnaround between matches as a possible problem.
"It's a difficult stadium and they have a fantastic crowd," he said.
"They defend well and have physical players for attacking and defensive set pieces. Their midfield is well organised and they have talent in attack.
"We only have two days to rest but it's the same for both."