"We finished the match with seven Under-21 players out there, but we gave the ball away far too often and caused ourselves unnecessary problems.
"Every ball that's gone up front has come straight back at us. We are own worst enemy in that respect."
On young star Gareth Bale and his teenage team mataes Tosh said
"He can be very pleased with his performance, and his part in the winning goal.
"We have been very impressed with him while he has been with us, there is a lot more to come from him but that was certainly a great start.
"We had Bale who is 16, Joe Ledley 19 and Lewin Nyatanga 17 playing down the left.
"And they did not look out of place, those three have been a real bonus for us."