Styles, 21, insists Tomlinson's actions in blasting Zayn, 22, and his producer friend Naughty Boy have damaged the band's reputation, causing a lot of tension between the pair, reported Female First.
"Harry is very aware of 1D's reputation and doesn't like getting into any public scrapes, especially with other members of the band.
"It's fair to say his relationship with Louis has been strained for some time and the last couple of weeks hasn't helped matters."
"Harry and Louis are working together in the studio in Los Angeles on 1D's next album. They're fine."
The row between Tomlinson and Malik took place on Wednesday night with the latter blasting his former bandmate for making "bitchy comments".
The spat between the long-time pals, who previously insisted they would remain close despite Zayn leaving the band, erupted after Louis mocked a picture filter Naughty Boy, whose real name is Shahid Khan, used on an image of him and Zayn in the recording studio.