Rashford has enjoyed a wonderful rise to prominence since breaking into the Manchester United first team around 18 months ago and many feel that the 19-year-old can go on to become a top player for both the Red Devils as well as the England national team in the years to come.
Smalling is a big fan of Rashford's abilities and believes that his Manchester United teammate has all the qualities in his repertoire to enjoy a very successful career at the very top.
The defender said: "The world is his oyster. He can be one of the best. You get forget how old he is, how few games he's played. But as a player he's got everything. He's quick, he's strong and his temperament is fantastic.
"He can do skills as well, not that you see skills in the game, he's a kid who wants to play football whether he's in his room or in the changing room, kicking balls, knocking things over. He's a fantastic talent and I'm glad he's on my team.
"I think it's that pace and movement, he constantly wants to run in behind. Gareth [Southgate] here and Jose want that striker who constantly runs in behind so it keeps you on your toes.
"He can give a reaction, I've kicked him a few times! He is someone who is very unfazed by anything which is great because he's played in big games, finals, and he's been the one leading our line. Full credit to him. There's always some young players you see them change but with Marcus I don't think he'll ever change. It's just the way he is."