I have had to deal with this situation in the past. I had a team who insisted on wanting to be where I was and if I didn't move quick enough, they ran into me. I let it lie for the first two occasions. On the third I called the captain in and had a word. I said that if any player on his team ran into me again I would caution. It only took one caution for them to get the message that I was serious.How would you deal with this @Brian Hamilton ?
Caution seems a bit harsh, a word may seem a bit petulant?