England defender Richard Smith has said he is worried he may not be picked for Team GB's squad for the 2012 Olympics.
The 24-year-old former Portsmouth player was left out of the Great Britain team currently competing in the Champions Trophy in New Zealand.
"There's three of us in a battle for two places in central defence," the Loughborough Students player told BBC Radio Solent.
"I'm definitely not guaranteed a place in the squad."
He added: "All I can do is my best and then hope that that is enough to be selected.
"The two guys I'm competing with, Richard Mantell and Iain Lewis, are top players with a lot of experience.
"They're both strong players and I have a lot of respect for their ability but that's not to say I'm not going to try my hardest to do so.
Smith is part of the 28-man squad that will be reduced to 16 for the tournament.
Smith is keeping a positive attitude despite being left out of the squad competing in New Zealand.
"I came to terms with it very quickly. We're a very strong 28-man squad and they only took 20 to New Zealand, two of whom have already come back.
"I don't feel too detached, we're still playing hockey, still working hard and still pushing for the same thing."
The team suffered a humilitiating 8-1 defeat by Spain on Tuesday meaning they are now left competing for places five to eight.