Davenport and his mother were attacked at 5am this morning outside their homes in Bedford, and both were rushed to hospital, with the ex-Coventry stopper being forced to undergo emergency surgery to his leg.
A 19-year-old man was arrested shortly after the incident and is still in police custody, but Bedfordshire Police have now confirmed that a 25-year-old man has also been arrested for attempted murder of Davenport.
A police spokeswoman told Goal.com: "An assault took place on Springfield Avenue at 5am this morning. A 26-year-old man was taken to hospital having received a stab injury. He is still in hospital and is not thought to be in a life threatening situation at this time.
"At the same time a 49-year-old woman was also injured and taken to hospital from Springfield Avenue in Kempston. She is also not thought to be in a life threatening condition.
"The 19-year-old man who was arrested this morning shortly after the incident is still with police at Greyfriars Police Station
"But in the last few minutes a further man, a 25-year-old man, has been arrested on suspicion of attempted murder, and he has been arrested in Derby. He is due to be escorted back to Bedfordshire for questioning this evening."
Neighbours and witnesses say that Davenport was stabbed "several times" and that there was "blood everywhere" at the scene of the crime.
One neighbour, Anne Desics, 61, who lives down Springfield Avenue said, "I just thought it was people passing by but then the ambulances came.
"I didn't see the incident, I just heard all this shouting. There was quite a lot of blood."
West Ham have issued a statement, wishing Davenport and his mother a quick recovery.
"The thoughts of everyone at West Ham are with Calum and his family and, due to the on-going investigation, no further information will be released," the statement reads.