All three new additions are in line to make their United debuts on Sunday in their Premier League opener against Arsenal at Old Trafford.
Mbeumo told TNT: "(Matheus) Cunha is a really good player, it’s good that we could share some training (sessions) on the pitch together because it’s always important to have good automatisms in the team, and a strong link in front," began the Cameroon international.
"(We've been doing) some striker work, some forward work. I think we still have some freedom up front, but there are some principles to respect.
"I don’t expect anything (in terms of playing positions). I think obviously it’s going to be the manager’s choice to play the players.
"Obviously, I think it’s important to be able to play different positions, so I’m going to be playing wherever I can."
On Sesko, Mbeumo says the newest signing is already making a positive impression.
"He looks like a cool guy," Mbeumo added of Sesko. "We’re just being normal, just having normal conversations. He’s a good guy.
"I think it’s important (to help people settle), especially when you come from another league and you don’t really know (about things here).
"I think it’s important to make them feel at home already. I think everyone is doing this naturally, we don’t really calculate anything, but I think this is really important.