Merino, who joined Newcastle on loan from Borussia Dortmund before recently making his move permanent by signing a five-year deal, picked up the injury against Liverpool last month and missed last week's 1-0 loss at Burnley.
Steve Cook's 90th minute victor for Bournemouth handed Newcastle with their second defeat of the week after losing at Burnley on Monday night.
It compounded a frustrating afternoon for Newcastle, who had seen Dwight Gayle have a goal debatably ruled out for offside when following in a shot from Matt Ritchie that hit the post.
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As of September 2017, British inflation stood at 3%, that is, double the rate of inflation in the Eurozone. The Bank says this effect is probably at its peak at the moment.
Newcastle play host to Bournemouth on Saturday, with Rafael Benitez's men looking to return to winning form following a 1-0 defeat at the hands of Burnley.
Benitez admitted his side had been made to pay for not taking their chances, and for a series of mistakes which contributed to their own downfall.
"You can't train as well with so many players around in the same position".
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It slipped behind T-Mobile to become the country's fourth biggest mobile provider, and has a significant amount of debt. The company that has championed unlimited data is now introducing a new plan with unlimited talk, text, and no data.
It was Newcastle's second successive defeat and posed further questions over their summer recruitment, but the Spaniard vowed to come out fighting once again. We have to understand that in these sort of games we have to do better.
"We're working with the players available now".
Had we taken a couple of the early chances our starting play created, it wouldn't have mattered, but we didn't and it did.
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"We have to keep going, we know we are Newcastle, a good team that has been promoted, and we were doing really well, so we have to go back to our principles".