Chennai, July 22 (IANS) Debutant director Arumuga Kumar, who has roped in actress Gayathrie for a pivotal role in upcoming Tamil adventure comedy "Oru Nalla Naal Paathu Solrena", believes she deserves more challenging roles. "I think she is one of the most underrated actresses of our times. She needs roles that challenge her potential. I believe she will bounce back strongly with my film," Kumar told IANS. Gayathrie will share screen space with Vijay Sethupathi, with whom she has previously worked in "Naduvula Konjum Pakkatha Kaanom" and yet-unreleased "Puriyatha Puthir". She is believed to play a tribal character but Kumar remains tight-lipped about her role. "It's best if I don't talk about her character now. It'd be best if audiences walk in without any expectations and get pleasantly surprised," he said. The film also stars Gautham Karthik.