The manager said:
"He came in to see us last week,"
"He is doing his rehab in Los Angeles. We have just said 'when you are fit and ready come over to Bolton and we will have a look at you again.'
"He is a lovely boy and a good player. The door is definitely open for him to come back."
Holden has made just three appearances for the Whites since sustaining the first of a series of horrendous knee injuries in a challenge with Manchester United's Northern Irish midfielder Jonny Evans back in 2011.
He remains a fan favourite at the Reebok Stadium despite his fleeting Wanderers career.