Cory Hill, Tomas Francis, Gareth Davies and Kristian Dacey will link up with the squad having been part of the Wales team that saw off Tonga on Friday.
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They will be joined by Scottish pair Finn Russell and Allan Dell, as the Lions draft in reinforcements for the second half of the Tour.
For McBryde, a Lions tourist in 2001, the call-ups are a sense of pride and he was thrilled for the players that they would get the chance to join up with the squad.
He said: “We’ve said from the outset that we’re here to support the British & Irish Lions should they need it, and we’re pleased to be able to do so now that four of our players have received call-ups.
“Kristian, Gareth, Cory and Tomas are great professionals who have made a very positive contribution to Wales’ tour so far, not least in the game at Eden Park. This is a proud moment for them and the whole Wales squad wishes them the best of luck.”
Wales head coach Robin McBryde announces our four new @lionsofficial call-ups back at the team hotel after Wales’ victory at Eden Park. 🦁 pic.twitter.com/UDu5L7Ypto
— Welsh Rugby Union 🏉 (@WelshRugbyUnion) June 17, 2017
The Lions continued their build-up for the Test series against New Zealand with a record win over the Maori All Blacks in Rotorua on Saturday.
Leigh Halfpenny scored 20 points as they ran out 32-10 winners, with just a week to go until the first Test.