I know there are mixed views on whether or not a dog should be allowed to play tug games, but I feel they are absolutely fine as long as they are not rough "playfighting" ending up with owner and dog on floor and dog being put in a position where it can learn to use its weight and power for control. (some dogs will still be fine even with this but not all ).
I play quite fierce games of tuggie with my dog, I tend to use a Ragger and the play is often her reward for something done well. I use it at the end of a track as many people feels this simulates the dog hunting with its pack and then getting into a tug of war when getting hold of the beastie they were tracking

If you follow rules, such as teaching the dog to drop immediately, and the dog obeys, there really is no cause for concern. If the dog does not drop, the toy gets put away or you re-train to drop or give. If the general relationship is good, and the dog obedient, and owner is in control, and tug games are used for reward especially, I have never heard of a case where it has gone awry.
If the dog has a fav. toy you can hide it so the wind blows the scent towards him, and then if he brings it back he gets a throw or tug as a reward.
Lindsay
Edited to add: if he isn't keen on retrieving you may find it helpful to fill a fluffy pencil case with tasty treats, and zip it up and let him play with it, then produce a treat out of it, this often gets a dog into retrieving mode :) .