"I had a similar one (back spasm) and missed the Liverpool game at home for Crystal Palace (in March). So I'll have an injection now and I will probably be back in 24 hours, which sounds crazy," Hennessey told reporters.
"It is one of those things, but it is a quick turnaround, you go from broke to mended in about 24 hours, which is good."
Hennessey, who has made 56 appearances for Wales, kept seven clean sheets in 10 qualifying matches, conceding just four goals.
Wales, who marked their first appearance at a major tournament since 1958 with that win over Slovakia and would guarantee a place in the knockout stage with a win over England, face Russia in their final group game on June 20.
(Reporting by Ian Rodricks in Bengaluru; Editing by John O'Brien)
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