Newcastle snapped the Gambia international attacker up from Danish side OB in the summer transfer window and then instantly sent him on loan to the Netherlands.
Minteh has wasted no time in battling for playing time at De Kuip and making an impact with the Dutch giants.
He was on the scoresheet at the weekend in a 3-1 win over Go Ahead Eagles in the Eredivisie and Slot is hugely impressed with what is being brought to the table by Minteh, pointing to his willingness and statistics.
“He certainly has no lack of confidence”, Slot said via Voetbal Primeur.
“The players laugh a lot with him and can also take a lot from him.
“His willingness is huge.
“Take the game against Ajax. Occasionally he was behind against Jorrel Hato, but he also put in a 70 metre sprint to chase Borna Sosa.
“His stats are impressive.
“He ran in sprinted metres against Ajax in an hour more than many guys do in two games.”
Feyenoord currently sit in fourth spot in the Eredivisie standings and are now on a six-game winning run, a record that will be tested when they play against Atletico Madrid in the Champions League this week.