'implies the need' is correctly used and can be used in written English.
For example, "The frequent blackouts in our town implies the need to invest in a better electrical infrastructure."
This implies the need of a voltage step-up transformer.
This implies the need to have sub-centers across the city.
Globalization undermines the effectiveness of state-based regulation and implies the need for alternative mechanisms.
This implies the need to formulate and solve multi-objective optimization problems.
This implies the need to deal with very serious mathematical complications.
This finding implies the need to specify a time frame within which porous asphalt permeability measurements must be made.
This implies the need for a careful selection of numerical tools suitable for convection-resolving simulations of atmospheric circulations.
This in turn implies the need to perform a very accurate stress analysis of the whole structure.
This implies the need for an operations control structure with the required robustness to safely perform autonomous procedures.
"The largest number of new infections for HIV is adolescent girls in sub-Saharan Africa, which implies the need to do something," he said.
This implies the need for sensitive, specific, and practical pipelines that return precise outputs while still enabling case-specific post hoc analysis.
