Liverpool star, Mo Salah was stretched after colliding with Magpies goalkeeper Martin Dubravka.
The Egyptian was conscious but was in some distress as he play was stopped for a lengthy period as he received treatment from Liverpool medical staff.
Salah was later replaced by Divock Origi.
Virgil van Dijk headed home from a Trent Alexander-Arnold corner after just 13 minutes but Christian Atsu levelled the score seven minutes later.
Mo Salah put Liverpool ahead for the second time with his 22nd goal of the season, but Salomon Rondon equalised midway through the second half.
Liverpool would have the last say five minutes from time as Lascelles headed into his own net to hand Liverpool a vital win to send them back to the top of the table.
They had to hold on with eight minutes injury time added due to the injury to Salah.
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