The former West Ham winger has been discussing the east London club's strikers.
And the 34-year-old feels the Croatian striker is a proven goalscorer but will only be used as an impact substitute at Upton Park.
That said, injuries to each of the forwards could give him increased game time.
Proven goal scorer at his best but will be used as a impact sub I feel. https://t.co/QWrPZkrj11— Matthew Etherington (@mattyethers) September 12, 2015
@mattyethers what sort of impact do you think Jelavic will have at West Ham this season?— Joshua Dodd (@JDodd_WHU1994) September 12, 2015
Meanwhile, Etherington also made a surprise claim on social media about Carroll.
The 26-year-old has struggled badly for fitness since joining West Ham but, at his best, is unstoppable in east London. In order to get the best out of the target man, however, the Hammers have to adapt their whole side and system.
But, even with that in mind, Etherington feels Carroll is a better forward than the prolific Diafra Sakho...
When the former winger was greeted with understandable disagreement, he clarified and confirmed his views on Carroll, stating that he is the best striker at West Ham when fully fit.
Fully fit Andy Carroll is the best striker at the club. Only my opinion. https://t.co/jlDNQS2Rw5— Matthew Etherington (@mattyethers) September 12, 2015