Tomkins has been utilised in the right-back position for much of the season so far, and he has been keen to take the opportunity to get forward.
However, Bilic has been keen to make sure that the 26-year-old does not carried away now he has a bit more freedom to roam.
"I think he knows that going forward will be more difficult for me and at times he tells me to stop getting forward when I am trying to gallop towards the other goal,” he said.
“Defensively, he knows I can do a job, but you have to strike the balance. Hopefully I am getting used to when to go forward and when to stay back.”
Tomkins has played at centre-back for most his career to date, but he has slipped down the pecking order at Upton Park.
Angelo Ogbonna and Winston Reid have established themselves as the Hammers’ first choice centre-back pairing, but Bilic has been keen not to take Tomkins out of his team completely given his undeniable talent.
The poor form of Carl Jenkinson has created an opportunity for Tomkins in a new position, and he has excelled thus far.
Tomkins has been very reliable so far this season, and he has helped West Ham keep two clean-sheets in their last two matches.