The city will this week expect to hear BT’s plans for its newly-acquired mobile telecoms arm EE and investors will also look for further details on how oil giant Royal Dutch Shell will make its BG Group mega-merger pay off.

BT, which completed its £12.5billion merger with EE last Friday, will report its third quarter results tomorrow.

Its acquisition of EE, which was cleared by regulators earlier in the month, will create a combination of around 35million mobile, broadband and TV customers.

Analysts expect BT to step-up its financial performance, as it enjoys its first full quarter since securing the broadcasting rights to Champions League football.

The telecoms giant expects a pre-tax profit of £840m, up 3% from £814m in the third quarter to the end of December 2014.

Analysts at the Bank of America Merrill Lynch said that “BT Consumer will benefit from a full quarter of Champions League games”, adding the business should gain customers as a result of the cyber attacks on rival TalkTalk in October.

In recent days Sky revealed it added 205,000 customers, its highest second quarter customer growth in the UK and Ireland for 10 years. It also announced the return of James Murdoch as its new chairman almost four years after he resigned from the company in the wake of the phone-hacking scandal.

BT’s tie-up with EE gives the telecoms giant 35% of the mobile consumer market alongside a similar share of the UK’s consumer broadband business. BT will be able to offer bundles of telecoms, TV, broadband and mobile to its customers to compete better with rivals such as Sky and Virgin Media.

Analyst John Karidis at Haitong Research predicts the merger will give EE more access to BT’s business clients, helping it snap up a greater share of the market.

BT’s acquisition of EE follows last year’s £10.3bn acquisition of O2 to Hong Kong conglomerate Hutchison Whampoa, owner of rival mobile operator Three, for £10.3bn.

Regulator Ofcom is currently carrying out its first significant review of the telecoms sector for a decade, and is considering options which include requiring BT to split-off its networks business, Openreach, which provides the final mile of network connection into consumers’ homes and is used by rival operators.

Rivals regularly complain about the service Openreach offers, but many industry analysts forecast that Ofcom’s recommendations will fall short of splitting the business away from BT.

Investors will press for further details from Royal Dutch Shell on its 49bn US dollar (£34bn) takeover of gas firm BG Group when the oil major posts its full-year results on Thursday.

More than 80% of Shell shareholders voted for the deal, and 99.5% of BG Group investors have passed the agreement in recent days, which leaves the purchase on track to complete on February 15.

There had been concerns over the rationale for the combination after recent hefty falls in oil prices due to oversupply and falling demand as the world economy slows.

The cost of crude slumped below 28 US dollars a barrel earlier this month and has collapsed by more than 70% since a peak of around 115 US dollars a barrel in the summer of 2014.

Shell has priced its BG acquisition based on oil prices rising sharply from their current low levels, predicting a bounce back of more than 35% this year and further rises next year.

London-listed Shell revealed the impact of the tumbling cost of crude earlier in January when it warned earnings are expected to more than halve for 2015.

The group said it expects full-year underlying earnings to tumble to between 10.4bn US dollars (£7.3bn) and 10.7bn US dollars (£7.6bn).

This is slightly below expectations in the City and marks a sharp fall on the 22.56bn dollars (£15.9bn) reported for 2014.

However, analysts at Barclays called Shell’s takeover of BG “a milestone”, giving the combination plenty of cash to withstand the low oil environment.

Rival BP responded to the falling price of oil by announcing earlier this month it would cut 4,000 production jobs worldwide, including 600 in the North Sea, over the next two years.

The City expects BP to post full-year results of 6.4bn US dollars (£4.5bn) on Tuesday, almost half of the 12.1bn US dollars (£8.4bn) it reported last year as oil prices have slumped.

BP chief executive Bob Dudley has said thathe expects the first half of this year to remain difficult, adding he hopes that supply might come more into line with demand in the second half of the year.

This month industry hopes were raised after Russia, Saudi Arabia and other Opec nations were understood to be close to beginning talks about cutting production to stem oversupply.

BG Group will also report its full-year results on Friday, and analysts at UBS expect net earnings to tumble by more than half to 10.8bn US dollars (£7.5bn) in this low commodity environment.