Is there a SPORTS PHRASE [in particular, one relating to “soccer”] similar to "make sure all our bases are covered"?

Leave no stone unturned — TFD

Fig. to search in all possible places (as if one might search under every rock.)

"Don't worry. We'll find your stolen car. We'll leave no stone unturned."
"In searching for a nice place to live, we left no stone unturned."

to do everything possible in order to achieve or find something.

"Both sides have vowed to leave no stone unturned in the search for peace."

Not exactly a sports phrase, but this is popular. Also,

Be through and through — TFD

thoroughly; completely.

"I've studied this report through and through trying to find the facts you've mentioned."

I don’t know if the origin of the similar expression:
“cover all {the} angles” (from ‘WordReference[dot]com)
is related to sports, but as used in the following excerpt from page 17 of
Teach'n Beginning Defensive Field Hockey Drills, Plays, and Games Free Flow Handbook by Bob Swope (via ‘Google Book’),
it does seem to be relevant to at least hockey (and possibly any other sports, like soccer, that have goalies guarding a goal):

Positioning Around Goal (No. 11)
Object of the activity: Teach all your goalkeepers how to cover all the angles a shooter might come in towards the goal on.

Another possibility (not specific to sport) is: ready for every contingency.

A "contingency" is a possible but not very likely future event or condition;an eventuality; a future emergency that must be prepared for.

Example: The United States is ready to deal with any contingencies in North Korea, a White House spokesman said on Thursday, dismissing Pyongyang's warning that it could preemptively strike U.S. forces as nothing new". (Reuters source)

Not specifically related to sports, but consider leave no loose ends untied and dot the i's and cross the t's

dot the i's and cross the t's

(idiomatic) To take care of every detail, even minor ones; To be meticulous or thorough.

Before taking the project to the CEO, let's make sure we dot the i's and cross the t's.

Wiktionary