The 29-year-old went down near the centre circle with no other players around him in the 62nd minute of the game at the Vitality Stadium.
Luton boss Rob Edwards quickly raced onto the pitch to check on Lockyer, who also suffered a worrying collapse in the Championship playoff final at Wembley earlier this year.
The Wales international underwent heart surgery following that incident but was given the all-clear to return to football ahead of the club’s first season back in the top flight.
Lockyer received several minutes of medical attention on the pitch at the Vitality Stadium, during which time the visibly-upset other players were taken off the field by referee Simon Hooper.
The Luton skipper was then stretchered off the pitch to a standing ovation from the crowd, and the Daily Mail reports that a Bournemouth doctor has confirmed that the defender is “alert and responsive”.
A statement posted on Luton Town FC official X handle says. “We all hope and pray for our leader and captain Tom Lockyer, who is thankfully responsive and has been taken to hospital.
We don’t know the full extent of what happened and what the next steps are at this stage, but we thank Bournemouth and the medical staff on both sides for their immediate response, which was absolutely amazing.
We are sorry to all supporters present that players from both sides were in no state of mind to continue with the game after seeing their much-loved teammates and friend taken off like that, and staff could not carry on with managing the game in such circumstances having had to deal with the situation.
We thank everyone for the wonderful applause and singing of Locks’ name inside the stadium at such a difficult time.
Now is the time for all of our players, staff and supporters to come together as we always do and give our love and support to Tom and his family.
Our thoughts are with him and them all.
Another post says,” Our medical staff have confirmed that the Hatters captain suffered cardiac arrest on the pitch, but was responsive by the time he was taken off on the stretcher.
He received further treatment inside the stadium, for which we once again thank the medical teams from both sides.
Tom was transferred to hospital, where we can reassure supporters that he is stable and currently undergoing further tests with his family at his bedside.
We would like to thank everyone for their support, concern and loving messages for Locks.
