Li Ka-shing faces a long road to restoring his credibility in telecoms. A 10.3 billion pound ($15.0 billion) takeover of Telefonica's British O2 unit was an important step in making the Hong Kong tycoon's huge, multi-year bet in the European mobile sector pay off. If Li's CK Hutchison group cannot overturn a likely veto from EU competition tsars, the UK operator will either have to carry on as a disruptive fourth player, or scavenge for a fallback deal.

Telecoms in Europe and Asia account for 24 percent of overall enterprise value for CKH, Goldman Sachs estimates. The division's importance has risen as some of the conglomerate's other businesses, especially energy, have suffered. Three UK is the biggest of Li's European telecoms assets by sales and customers. A deal with O2 would have transformed a "challenger" into Britain's top mobile network and brought up to 4 billion pounds of synergies.

So a knockback by Brussels, egged on in London, will hurt. At least Three UK, like most of its European sister outfits, generates cash: EBITDA less capital expenditure was a respectable 328 million pounds last year. That reduces the immediate pressure to act but Li's options still look bleak.

The first step may be to appeal a regulatory rejection. While some big EU merger vetoes have taken years to contest, a fast-track appeal could be heard within months.

Even so, there is no guarantee CKH will prevail. And if it does, Telefonica might have already found another buyer for O2.

A standalone Three UK, meanwhile, looks uncomfortably small and mobile-focused, just as rival BT plans to woo customers by bundling mobile, landline, broadband and TV. So if the lawyers can't fix things quickly, CKH may need to consider alternative deals.

Li could explore a joint venture with either Liberty Global's Virgin Media, or Sky, in order to create its own "converged" offering.

Neither would be simple: Liberty may be wary of limiting the scope for a future tie-up with Vodafone, and Sky is a broadcaster not a network operator. Both rivals might prefer to pursue O2 instead. That is even more reason for Li to put in some calls.

The author is Quentin Webb, a Reuters Breakingviews columnist. The article was first published on Reuters Breakingviews. bizopinion@globaltimes.com.cn