Learn Italian: La sua agilità lo rende idoneo per la squadra. - His agility makes him eligible for the team.

The adjective idoneo (suitable, eligible, fit) requires the preposition per when introducing the specific thing, group, or purpose someone is suited for. If the sentence instead said he was eligible to play, it would still use per before the infinitive verb, such as idoneo per giocare.

Why does the sentence use rende instead of fa to mean "makes"?

When "to make" means causing someone or something to take on a certain quality or state, Italian uses rendere followed by an adjective. Saying lo fa idoneo is incorrect. You would only use fare if you were making someone do an action, which requires an infinitive verb rather than an adjective.

Is idoneo only used to mean "eligible"?

No, idoneo is a very common and versatile adjective meaning suitable, fit, appropriate, or qualified. While "eligible" works perfectly for sports teams or competitions, you will also see it used for things like a suitable location (un luogo idoneo). Note that when expressing suitability to something rather than for something, it can sometimes take the preposition a instead of per.

Why do we need the definite article La before sua agilità?