* Allied says has made indicative cash offer

* Allied says no certainty of offer or at what price

LONDON, Dec 23 - Allied Healthcare International (AHCI.O) said it had made an indicative cash offer for homecare services provider Supporta (SOR.L), sparking the prospect of a bidding war with British social housing provider Mears (MERG.L).

Mears, which provides social housing maintenance as well as domiciliary care services, said on Dec. 18 it had agreed to buy Supporta in an all-share deal worth 27 million pounds ($43 million). [ID:nSGE5BH07V]

However, shareholder Romac Investments, which holds a 28 percent stake in Supporta, said on Dec. 22 it believed the Mears offer materially undervalued the company and urged other shareholders not to accept it until an unnamed rival bidder had conducted due diligence. [ID:nSGE5BL0F7]

Allied identified itself as the other potential buyer on Wednesday but did not reveal what price its offer approach had been pitched at.

Discussions with the board of Supporta and its advisers are ongoing and Allied is currently undertaking a due diligence exercise. It should be noted that there is no certainty that an offer will be forthcoming or, in the event that one is made, on what terms, Allied said in a statement.

(Reporting by Matt Scuffham; Editing by Lorraine Turner) ($1=.6269 Pound)