Book “Fatawa Muyasarah” compiled from fatwas of ayatolla Sistani.
At page 421 you can read:
Q: Is it permissible to ask for sustenance, a child, protection or intercession directly from the infallible ones?
Sistani: Let me ask you first. Do you seek this from them because they create, or sustain, or protect?
Questioner answers: Certainly not. But rather because they are the means to Allah Subhana wa Taala, the intercessors with Him in the disposal of affairs, and because they cannot do anything but with the permission of Allah, the Sublime and Exalted.
Sistani: You mean that they ask Allah the Exalted and He creates, and they ask Him and He sustains, and they ask Him and He protects, and because they are intercessors, whose pleas or supplications are not rejected, because of their status with Allah, the Sublime, and for their guardianship over us?
Questioner: Yes, I mean that.
Sistani: This is permissible. Allah (s.w.t.) says: “…and seek means of nearness to Him…” (Qur’an, 5:35) and they (alaihuma salam) are your means of approach to Allah Subhana wa Taala. This is permissible.
So basicly he see no problem in person which lives (for example) in USA, and which would in early morning supplicate in English: Ya Abu Abdullah give me a child!
Just this person has to imagine that Abu Abdullah (which didn’t speak English)hear him in USA, exactly as he hear all his fellows all over the world in all languages, and he would simple forward his dua to Allah.
and ! Because He made us Muslims! And sane!
Such kind of dua, which was approved by this shia scholar is the very same shirk al-akbar, which removes person from the Islam!