Alnwick, who started his career at Sunderland, joined the Trotters in 2016 from Portsmouth and he has been a regular first-team fixture ever since, making 53 appearances across League One and the Championship.
The 31-year-old has been crucial for Bolton throughout this season's battle against relegation and he is expected to line up in between the stick in Tuesday's home clash against fellow strugglers Birmingham City.
As it stands, 20 players are coming to the end of their contracts at the Macron Stadium this summer, Alnwick being one of them, but the shot-stopper has provided a positive update on an extension.
'I have spoken to the club about a new contract and it's something both sides want to do,' he told the Bolton News. 'The club wants to give me a new deal and I want to sign. We're looking to get it done.
'But at the moment it's not really about me - I'm just playing my football and doing anything I can to keep this club in the league, then we'll sort it.'
Luciano Spalletti has played down claims there is a problem between him and Inter bosses as he is in the final year of his contract.
Crotone defender Federico Ceccherini has completed his move to Fiorentina on a permanent deal.