The American missed the visit to Burnley last weekend and was left out of the US squad for the upcoming international break.
Mauricio Potchettino said that he was set to be out for two to three weeks, and Iraola confirmed yesterday that Adams would miss the visit of United.
Asked for more details on the midfielder’s injury, and if he’ll be back for the Arsenal game on April 11, Iraola told the Daily Echo: “We hope he's back for the Arsenal game, but we don't know.
“I think it's an injury in the quad, the left quad, but it's not in the most important muscles, let's say.
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“Obviously there is an injury and that's why he feels some pain, but it will be a matter of how he feels.
“If clinically he's ready to run, we will not stop him, because it's something that is like more about his feelings than a big injury like, I don't know, you break your hamstring or the quad here and you are done and you are done and you have to wait until it's healed.
“This one I think we can deal with it a little bit better, or at least we have this, this hope that he can be involved in that game.”