The Lawn Tennis Association (LTA) will hold an internal inquiry into Great Britain's defeat to Lithuania in the Davis Cup.
The Great Britain team suffered a humiliating 3-2 loss to Lithuania over the weekend, a result that leaves the side facing a relegation play-off against Turkey.
If Great Britain are relegated they will be in the be dropped down to the Europe/African Zone Group III - the lowest ranking tier of the competition.
Captain John Lloyd has already stated he is unsure whether he will continue in his role, and LTA chief executive Roger Draper has now ordered an internal inquiry.
Draper said: "I share the deep disappointment and frustration at this result. Five defeats in a row is unacceptable.
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So I have asked the LTA player director, Steven Martens, to review last week's performance and result, and report back to me and the LTA main board as soon as possible.
"That review needs to be swift and decisive as it is clear some real improvements need to be made."