Roy Hodgson has revealed West Brom went 'into overdrive' when they discovered striker Shane Long had a heart problem, but he is now fully recovered and could face Wigan on Saturday.
The 25-year-old was reportedly diagnosed with pericarditis, an inflammation of the sac surrounding the heart, brought on by an infection.
Hodgson insists the club have taken the utmost care with their treatment of Long as they prepare to welcome him back into the fold.
"Anytime anything affects the heart region it's a concern of course, we don't take any injury or sickness lightly," Hodgson was quoted as saying by the Daily Mirror.
"But whenever the heart is mentioned, you suddenly go into overdrive.
"We did all the tests. Quite extensive tests to be 100 per cent sure.
"It's important to check those things out because a heart injury is not like having a sore ankle or knee. But it was a virus which unfortunately settled in that area.
"In the end, there was never any question that his heart was in any way other than perfect shape."
Long admits it was a scary time when he did not know what the problem was, whilst expressing relief that his condition has now returned to normal.
Long, 25, said in The Sun: "I couldn't breathe or run properly.
"I thought it was a digestion problem at first that morning - but I knew there was something wrong then.
"It's caused by an infection and is a fairly common problem.
"The treatment is straightforward - they put you on anti-inflammatory tablets and the swelling goes down and you're fine.
"But when I didn't know what it was, I was thinking all sorts of things."