Foreign learners quite often want to say something like - "we discussed about last night's match". This is perhaps not surprising, for two reasons:
- "discuss" is really just another (more formal) way of saying "talk about"
We discussed (talked about) the new system. - the noun "discussion" is often (and correctly) followed by the preposition "about"
We had a discussion about the new system.
But in Standard English, we don't use discuss about like this.