Eddie Jones insists England followed concussion protocols "to the absolute letter" when Elliot Daly was injured in the Six Nations victory over Scotland.
Daly underwent a head injury assessment in the opening minutes of last Saturday's match at Twickenham following a dangerous tackle from Scotland hooker Fraser Brown, who was yellow-carded at the time and cited on Monday.
The versatile Wasps back hit his head on the ground as he landed, while his face also collided with Brown's head in the incident.
Daly was initially allowed to return to the fray, but was duly replaced by Anthony Watson after complaining of blurred vision.
Detailing the assessments that Daly faced, Jones told The Times: "He had a test by the match doctor and was passed fit, went back on the field and had some blurred vision, was tested again by the match doctor at the end and passed fit.
"We don't have any concerns at all that we followed the protocols to the absolute letter."
Jones is optimistic Daly will be able to feature against Ireland this weekend, as England seek to complete a second successive Grand Slam and set a new record for the most consecutive wins by a tier-one Test nation.
"He's only got a busted nose now," Jones added. "We are positive he is going to be OK. He is fine. Very well."