The 16 year-old plays as a wing-back for Inter's U17 team and football experts rate the youngster the best for his age anywhere in South America.
United and City spotted Tobias in national team action for the U15s and both have registered their interest with Inter, says TMW.
The English giants are battling to secure a commitment from Tobias and Inter now - with the view to formally signing the player at 18 years of age.
Real Madrid are also taking interest in the transfer battle.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!