The phrase "also if necessary" is correct and usable in written English.
It can be used to indicate that something should be done in addition to other actions, but only if it is required or appropriate.
Example: "You should complete the report by Friday, and also if necessary, prepare a presentation for the meeting."
Alternatives: "if needed" or "if required".
Central government can also, if necessary, suspend the region's self-government.
We need rules of conduct and also, if necessary, direct intervention from the state to correct the more intolerable inequalities".
Again, concrete beams are reinforced in their weak tension zones and also, if necessary, in their compression zones, by steel-reinforcing bars.
Yellen said the Fed had a number of tools to deal with bubbles, including regulatory measures, such as restricting leverage, but also, if necessary, raising interest rates.
And it is an intelligence force armed with cyberweapons, assigned not just to monitor foreign computers but also, if necessary, to attack.
Yisrael Katz, the minister of transportation, told Israel Radio that if he were President Mahmoud Ahmadinejad of Iran, he would be worried "because from today the state of Israel will be more united, both in its ability to deter and also, if necessary, in its ability to act".
In order to develop such circuits, a wide variety of influences need to be considered and also compensated if necessary.
The extra tank volume up to V/A of 0.15∼0.2 is also available, if necessary to secure more water.
The agency also plans, if necessary, to look at some of the small workshops that supply the consolidators.
Some Conservative backbenchers have even said the government was also ready, if necessary, to fire Mr. Patten and other top BBC executives in a purge to show sympathy with public concerns about the scandal.
The coach also said if necessary he will make use of the rule that allows an injured player to be replaced up to 48 hours before their opening match.
