COLOMBO, (Reuters) – Sri Lanka spinner Muttiah  Muralitharan is still having treatment on a knee injury and will  miss the second test against Pakistan starting on Sunday.

The 37-year-old, who has injured his patella tendon, is also  a doubt for the third test.

Wicketkeeper Prasanna Jayawardene returned to full training  this week, but was also not considered for selection as Sri  Lanka, who lead the three-match series 1-0 after a 50-run  victory in Galle, named an unchanged squad.The only selection dilemma is the form of opener Malinda  Warnapura, who has scored just 12 runs in his last four innings.

Sri Lanka skipper Kumar Sangakkara called for improvement  from his batsmen.

“We had a great final day in Galle but we all know that we  were not at our best during the first three days and we have to  improve,” Sangakkara told Reuters.

“The batsmen in particular have been working really hard  this week,” he added.

“We need to be more patient, be much tighter with our  techniques and work through tough phases against a decent  bowling attack.”

Pakistan captain Younis Khan put the first test defeat down  to the pressure on his young players as the team collapsed from  71 for two to 117 all out in the second innings.

“We have youngsters in the team and I think they will learn  from their mistakes,” he said.

“If we play to our potential in the next two tests we may  square the series or win it.”

Former skipper Shoaib Malik, who bats at number six, could  find his place under scrutiny. He last scored a century in March  2006.

Young all-rounder Fawad Alam, 23, could be a possible  replacement after an impressive 83 not out in a warm-up game  before the Galle Test.

Sri Lanka squad: Kumar Sangakkara (captain), Malinda  Warnapura, Tharanga Paranavitana, Mahela Jayawardene, Thilan  Samaraweera, Tillakaratne Dilshan, Angelo Mathews, Chamara  Kapugedera, Rangana Herath, Ajantha Mendis, Thilan Thushara,  Nuwan Kulasekara, Dhammika Prasad, Kaushal Silva, Suranga  Lakmal.

Pakistan squad: Younis Khan (captain), Salman Butt, Khurram  Manzoor, Mohammad Yousuf, Misbah-ul-Haq, Shoaib Malik, Kamran  Akmal, Umar Gul, Saeed Ajmal, Mohammad Aamer, Danish Kaneria,  Abdul Razzaq, Abdur Rauf, Fawad Alam, Faisal Iqbal.