The Uruguay international is Atletico's top scorer in all competitions this season, albeit with just nine goals from 27 appearances.
The 34-year-old, whose contract at Wanda Metropolitano expires at the end of the campaign, has only found the net once in his last 11 club matches.
Suarez's frustration was evident when he was substituted during last month's defeat at Sevilla, with the former Liverpool striker appearing to direct expletives towards coach Simeone.
With the striker's sharp shooting deserting him and his future uncertain, the Atleti boss said there have been discussions between the pair in recent times.
Ahead of Atletico's Copa del Rey clash with Real Sociedad on Thursday (AEDT), Simeone said: "We have spoken with Luis for two months about what I think of him, of how important he is for us.
"What I think of him, he knows it and I didn't speak to him after Sevilla, I have spoken to him for two months."
Suarez has scored 30 goals across all competitions since his September 2020 transfer from Barcelona – more than any other Atletico team-mate. Karim Benzema (54) and Gerard Moreno (41) are the only players currently based in Spain to have scored more often during that time.
Additionally, only Messi (231) betters Suarez's tally of 175 LaLiga goals since the Uruguayan joined Barcelona from Liverpool in July 2014.